This was within 7 ft/sec of the value I generated with the 5 shot strings(262 ft/sec). Stay safe, yall! The 7.6251 NATO chamber is imperceptibly longer than the .308 Winchester, extending between 0.006 and 0.010 inches beyond the .308 SAAMI specs. SDs and ES were superior from the longer barrel, as was the sight picture. Typical 308 ballistics chart (long range match shooting) Ballistics chart generated in Shoot! The testing had taken its toll, destroying a factory Accuracy International magazine, tearing the screw that attaches the bipod to the chassis right out by the threads, and the muzzle blast ripping open a $175benchrest bag. Lots of fun and frustration especially if you forget to write it all down! The latter has nearly twice the propellant, and is therefore better able to fell very distant game. I bought a quart. _gaq.push(['_setAccount', 'UA-6323545-2']); home + Unlike older cartridges such as the 308 [], As stated in my M45A1 review, write USMC on something and Ill buy it. When you switch this out with a .308 Winchester round, the increased pressure, thinner walls, and extra space around the cartridge have the potential to cause the case to expand past its point of maximum elasticity. (function() { A 20 inch barrel is a good balance between power and portability. data is provided purely for entertainment purposes - to better facilitate arguments When that happens Ill post a link there. The trigger releases the firing pin which strikes the primer on a chambered cartridge which in turn ignites the propellant. The bolt action pistol with a 5 barrel (above). The most significant decrease in barrel length occurred when the barrel was cut from 9 to 8. Headspace was measured at 1.633+ (.003 over minimum). I use a Forster Match Rife Headspace Gauge Kit. Last week I found out Cerakote has a color called USMC Red. All in all, this was a very thorough test by the folks at RifleShooter.com. It's fine to 600-800 yards and is fine at that range out of an 18" barrel. Interestingly, these numbers jive pretty well with estimates found in reloading manuals. In fact the .308 Winchester 165gr bullet is traveling faster at 1000 yards than the .223 or 7.62x39mm at just 500 yds. Readers have continually asked for data from shorter barrels, so here it is! Thanks for the kinds words about the 308 and 300 Win barrel length posts. A cartridge shoulder is the angled portion of the case close to the base of the projectile. Articles may contain affiliate links which enable us to share in the revenue of any purchases made. I actually had this happen on two different mags. This results in a 7.62 case that is ever so slightly longer than its commercial brother. How to Sight in a Scope - Step by Step Guide. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. It includes gauges in .001 increments. The .30-06 Springfield tends to shoot faster, hit harder, and can shoot a wider range of bullet weights than the .308 Winchester. Velocity Boundaries (Feet per Second) of: 1740 1460 1460 1460. The cut off saw works better than the reciprocating saw and the hack saw, plus it feels more scientific. 7.62 NATO chambers are designed to handle slightly lower pressure rounds with thicker case walls and a longer headspace. The cuts were made in one-inch intervals with a rotary saw. I shook vigorously from head to toe. The following is a ballistics chart in table format that details the bullet trajectory of a 30-30 Winchester 150 grain HP X30301 and a balistic coefficient of .218. That said, we wouldnt make a habit of it. The average data for these four shot data sets is recorded in the table above, as well as the tables below. site designed and maintained by Coeurbois Graphic Design. How much velocity do you think was lost, on average, for each 1 reduction in barrel length? Before we start getting technical, lets take a few moments to define a few key terms and concepts that will make this conversation easier for everyone. While we have went to great lengths to make sure that it's as accurate as possible this rendering should not be used to generate specs for casings. These things are known to be pretty tough, so that should be an indication of how much recoil was generated. Just ask Todd Hodnett. The 7.62x51 NATO is a superior round to the .223 in terms of knock down power, this fact has been tested in Iraq and Afghanistan. As an all around work horse for sniping that works great for both Law Enforcement and military sniping, the .308 is hard to beat. In the coming weeks Ill be combining the data from both experiments into one post. . These graphs assume a 1.75 height of the optic over the bore and weather conditions of 59F. When looking at .277 Fury's ballistics, . Coming out of the muzzle, it maintains speeds around 2,750 to 2,800 fps. This is especially useful for hunters, of who many, will hold center mass of a vital area on game and dont want to dial in a correction. Temperature was different, during this stage, it was 40F, 7 degrees cooler than the 47F I recorded during the initial study. 28 barrel ft/sec and 16.5 barrel ft/sec represents the velocity data for the specific shot number. So in quick summary the .308 Winchester also known by it's military name the 7.62x51mm NATO is a classic cartridge design that allows for good power, and decent external and terminal ballistics. The IMI Samson 150 grain FMJ is a 7.62x51mm NATO spec cartridge. Ballistics by the Inch (often called BBTI) was a project to test the performance characteristics of a variety of common handgun calibers/cartridges. lb Muzzle Velocity ft/sec. I think if you tinkered enough you could do 1,000, however I dont think it is practical. Looking for a two-minute summary of the differences between 7.62x51mm NATO and .308 Winchester? Of course, this all takes place within mere fractions of a second. Ive been beating on the 510 and 517 for a while. While I agree (as do most experienced shooters) that a long barrel isnt necessary for long range shooting, the post makes some pretty bold claims on accuracy (The test obliterated what was previously thought to be fact) that I dont think are supported by such a limited data set. Why you ask? Never miss a post! The short answers to these questions are yes and maybe. This resulted in a velocity loss of 118 feet/second. Contact the author here. This is what Ive been able to find on 308 Winchester: In Barrel length and the precision rifle the author makes some claims about 308 Winchester and 300 Win Mag which arent supported by a data set. By ammo type, the average loss per inch was: 24.6 (Win 147 FMJ), 22.8 (IMI 150 FMJ), 20.9 (Fed GMM 168gr), and 22.5 (Win 180PP). Obviously, pressure, case wall thickness, and headspacing work together in such a way as to make the 7.6251 NATO and the .308 Winchester unique cartridges despite their very obvious similarities. Compare that to a 5.56 Ball M193 round's 55 grain bullet, which delivers a . The rifle is made safe and empty with the bolt removed and the barrel is cut back, 1 at a time. The U.S. Army lists the 7.62s effective range (and thus, the .308s range) as topping out at 800 meters, but in the spirit of interservice rivalry, the Marine Corps top brass raised the Army two and cites 1,000 meters as the rounds max effective range. The following is a 1000 yard .308 ballistic chart that was created using our free online ballistic calculator and details all aspects of the bullets trajectory from the millisecond it leaves the barrel until the time it reaches the 1,000 yd mark. Turning a sporter contour rifle barrel from a blank, 6.5 Creedmoor loads: 107 SMK IMR 8208 XBR and 142 SMK Superformance 6.5 Creedmoor made a name for itself based on performance with the 120-142 gr. Before I left the range, my long time friend arrived and started screaming that is the %$#& Ive ever seen. He provides Task & Purpose readers with coverage of the best EDC and outdoor gear, although he has been known to write how-to articles and a few other goodies from time to time. recording sheets. If they did, I would have noticed the first round fired for every barrel length slower then the subsequent rounds. You may not reproduce original text or photos without advanced permission in writing. Flawlessly. The 7.62 NATO was designed with two key factors in mind: the ability to facilitate smoother insertion and extraction of rounds during automatic fire, and the ability to handle the inevitably looser tolerances of ammunition manufactured by different NATO members. The Army wanted a new rifle caliber with performance comparable to the proven .30-06 but with a shorter overall length, a new wonder cartridge. For instance, the Berger Reloading manual says for the 308 Winchester, muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24 barrel. Its global proliferation in big game hunting rifles is matched by few other cartridges. If you think that you discover an error (perhaps a typo) in the data, just drop us a Selecting the best barrel length for the .300 BLK can be a double-edged sword. Need help keeping it straight? In the next frame you can see the gun recoiling (below). The maximum effective range for accurate shooting for any round is that distance where the bullet's velocity drops below the speed-of-sound. ), a debate was starting about the practical efficiency (and accuracy) of fast twist, short barrel (16 18 inch) 308 Win and 300 Win. Time. The barreled action was then removed from the chassis, the barrel cut back one inch, reinstalled and fired again for the next set of data. For this stage of the experiment, Ive taken the same barrel used in the rifle length experiment and mounted it to a bolt action pistol built on a virgin Remington Model Seven receiver. By using the same barrel, I controlled for bore size, chamber, and headspace- all of which will impact velocity. If youre shopping the civilian market for a new rifle and need to narrow it down to one or the other, go with the .308 Winchester option. Would be interesting to find out. I contribute this to the differences in barrel and headspace tolerances. _gaq.push(['_trackPageview']); Notice the rounds have similar external ballistics with the different barrel lengths out to 500 yards, past 500 the differences become significant. 7.62 NATO (a.k.a., 7.62x51mm) and .308 Winchester are two very common rifle cartridges commonly used by U.S. service members and civilians. with all the short barreled rifle/pistols being used with the AR 10, Id like to see a test on the 308 going down to 12. pistols are measured, but revolvers are measured as the length of the barrel in front of Note: I did not run the 180 grain Power-Point because I dont view it as a distance cartridge. Do you trust the results from the MagnetoSpeed? Enter your email address to subscribe and receive notifications of new posts by email. | Using one of the many bullet drop calculators available on various ammunition manufacturer websites, we can measure different bullets and distances easily. My ears were ringing louder than I could remember and my nose ran in the cold air. For more on sample size, see the discussion here. Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. At each cut length, velocity was measured with a Magnetospeed chronograph. At 55 grains, its bullet achieves 3,910 fps; at 100 grains, 2,960 fps. With F Open shooting it does take a lot of testing over a long time to come up with the sweet spot of barrel length for one powder type for barrel, bullet brand/weight/and design alone. My calculations assume a 1.75 sight over bore height. The statistics shown above demonstrate the advanced speed capabilities of the 6mm ARC. In addition to riding on the back of the 7.62 NATOs short-lived military career, the .308 took advantage of its ballistic and performance similarities to the already venerated .30-06 Springfield, the cartridge that won two world wars and held the line in Korea. While the external dimensions of both 7.6251 and .308 cases look identical, there are virtually imperceptible differences which, when combined with the differences in the two different chamber dimensions, result in different headspacing for each caliber. Welcome Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. .308 Win Barrel Cut-Down Test: Velocity vs. Barrel Length, .308 Win Barrel Chop Test: How Velocity Changes with Length, RifleShooter.com .308 Win Barrel Cut-Down Velocity Test, Surprising Results in .223 Rem Barrel Cut-Down Velocity Test, .223 Rem Velocity by Barrel Length Cut-Down Test Results. If you take a look at the series posts (below) on my 16.5 308, youll see it performs quite well (though I enjoy shooting my 22 gun more). 100% real. Since we would be gathering data on 52 different barrel length and ammunition combinations and would not be crowning the barrel after each cut, we decided to eliminate gathering data on group sizes. This was noticeable from 19 inches and below. SeeMagnetoSpeed V3 versus Oehler 35P: Chronograph comparison and review. So, what gives? 20" seems to be ideal for the 7/08 and the 308. from 18" to 20" on a 7/08 I gained almost 200 ft/sec. Until then, stay safe. At 1000 yards a .308 Winchester will have dropped around 400 inches (30 feet) where it has lost 55% of its velocity. Muzzle: 100 YDS: 200 YDS: Velocity (FPS) 3050: 2691: . ga.src = ('https:' == document.location.protocol ? However, testing indicates it may not be as much as initially thought. The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. The answer may surprise you. Cutting the barrel from 28 to 16.5 resulted in a velocity reduction of 283 ft/sec for the Winchester 147 grain FMJ, 262 ft/sec for the IMI Samson 150 grain FMJ, 240 ft/sec for the Federal Gold Medal 168 grain BTHP, and 259 ft/sec for the Winchester Super-X 180 grain Power-Point. cartridge is also about .2-inch shorter. Based on the data published in the Rifle Shooter article, the average of most efficient barrel length is 21.7 inches. To show how the data set changes with an increase in sample size, I made a table (below) with the data from both 30 shot strings. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. In308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), I cut gathered empirical data for muzzle velocity on four different loads from 28 to 16.5. Registration on or use of this site constitutes acceptance of our Terms of Service. This weight is more appropriate for whitetail deer and other small-medium sized game. Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) Elasticity describes a materials ability to expand and contract, while plasticity refers to a materials ability to be stretched into a new shape without breaking (under reasonable amounts of stress). These seem much more durable over the long run. This allows it to keep a supersonic muzzle velocity at 1,000 yards. The .308 just lacks the horsepower for truly long-range shooting. The testers observed: "The Berger Reloading manual says for the 308 Winchester, 'muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24 barrel'." How the Test Was Done The testers described their procedure as follows: "Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. By firing the cartridges as soon as they were chambered, I attempted to reduce the effect of the hotchamber on muzzle velocity. The first number is the value of this cartridge, and the last number is the value of the most powerful round in our bullet database. Looking for the perfect accessories to accompany your new .308 or 7.6251 rifle? No further tests will be conducted, but we will maintain this site and data for the use of Ballistics and Drop for the .308 Winchester (7.62mm NATO) Cartridge Type: Rifle Height: 2.015" Width: 0.473" Average FPS: 2681 Average Energy: 2617 Average Gr: 164 Recoil: 1.95 Power Rank: 4.4 of 20 The .308 Winchester / 7.62x51mm NATO was created in 1952 and is based on the .300 savage round a round created in 1920. The bullet does not drop below the speed within . UPDATE 12/30/14: I tapered the barrel and installed a brake. The IMI 150 grain FMJ 7.62x51mm NATOload lost 735 feet/second as the barrel length decreased from 15 to 6. numbers. After 15 years Im still working it out. _gaq.push(['_setAccount', 'UA-6323545-2']); These pressure differences are almost negligible, yet they can have a significant impact in the real world for anyone who owns a 7.62-chambered firearm or who likes to reload their own ammo. The barrel did heat up during firing. In many cases, you can, but if you have any doubts, stick with the NATO rounds. The muzzle blast from the short barrel eroded away some of the chassis! Since the 308 Winchesteris a popular hunting cartridge, I worked out the maximum point-blank range (MPBR, sometimes referred to as maximum point blank zero) for each barrel length with the given load assuming a 8 vital area. Mag. the cylinder gap. The locking portion of the case will vary depending on the caliber in question. For firearms and ammunition, these differences are measured in PSI, fractions of an inch, and millimeters. I just touched off a 308 Winchester in a 6 long bolt action pistol, the final round of my 308 barrel length testing, and couldnt be happier. February 1, 2016 This is how semi-auto All in all, this was a very thorough test by the folks at RifleShooter.com. I am cutting up a barrel. 308 Winchester/ 7.62x51mm NATO Comparison of velocity data. All content Copyright 1998-2018 Rifleshooter.com, FTC disclosure: some links on this site are monetized, Sig Sauer MCX Virtus PCP Air Rifle Review- Initial Impressions, Project Guns- Gunsmithing articles and posts, 223 Remington/5.56 NATO, velocity versus barrel length: A man, his chop box and his friends rifle. We also have a 223 and 7 rem mag up there. While most modern 7.6251-chambered firearms are specced to safely handle .308 cartridges, older NATO-chambered guns are not. I fired 30 rounds of IMI Samson 150 grain FMJ at 28 and 16.5 and recorded the results. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. It seems like the 7.62x39mm Russian performance is optimum at a 16 barrel length. rifle, you should be fine firing any modern commercial .308 Win. All 7.6251 rounds are cool for use in the proper NATO weapon, but 7.62x39 is the original caliber of the infamous AK-47. Fear not. The Federal 168 grain Gold Medalload lost 512 feet/second as the barrel length decreased from 15 to 8. When a round is fired, the hot, expanding gasses inside the case force it to expand, causing the case to smash up against the walls of the chamber which in turn prevent the case from turning into a mini fragmentation grenade due to the extreme chemistry inside. Troubleshooting seized ejectors. 7.62x51mm) and .308 Winchester the same thing? Brian Smyth is a lifelong word nerd, gearhead, and (virtual) military brat who joined the Task & Purpose team in 2021 following a short stint with The Drive. Nearly every target shooter had his teeth cut on a 308 Winchester. The barrel was cut off using a cold saw. I post it here, for free, so other shooters can learn from it. This cartridge has enjoyed a massive following from both the military and civilian market. At 10-inches, muzzle velocity hasn't reached its peak. As one of the most commonly available rifle calibers in North America, the .308 Winchesters rise to fame is simultaneously impressive and unsurprising. This results in a 7.62 case that is ever so . What do you think of the MDT LSS chassis? Released by Winchester in 1952 (and adopted by NATO in 1954 as the 7.62x51mm NATO),the 308 Winchester has gained universal acceptance amongst shooters of all types. We used products we I had 100% extraction during the course of this experiment. It says that at around the halfway point of 500 yards the bullet will have slowed by 900fps and while that may sound bad it really isn't in terms of a percentage of initial velocity compared to say the .223 Remington (would be 1481fps from initial 3214fps) or the 7.62x39mm (would be 1066fps from initial 2349fps). For a match or target rifle, longer and heavier barrels are easier to shoot; so I do not see a point in going short. Your data showed the 7.6239 mm Russian slowed down from 23 to 24 in barrel length. Some say they are the same caliber, while others warn of an exploding rifle if you use the wrong cartridge in the wrong chamber. Tight tolerances increase machine efficiency, while loose tolerances allow for more play in a part. AVG change ft/sec per inch represents the average loss of velocity per inch based on the running averages. I also took the time to groove the barrel in one inch increments from 16.5 to 28 as a cutting guide. I offered to let him shoot it. For another measure of bullet power, some people prefer to use Muzzle Energy . This was an average decrease of 81.7 feet/second per inch of barrel length. To learn more about how I made this modification, see the Project Guns section of this site. JHP: Cor Bon 225 gr. Drop (Inch) / 0-3.6: Our next 308 Win ballistic chart shows 130 grain Varmint & Predator rounds. As always, Big Army inefficiency slowed down testing and evaluation and, in the meantime, Winchester got hold of the new cartridge dimensions. Thank you. It will a produce a line graph showing the bullet drop and flight path of the bullet. While the .308 Winchester is the civilian competitor and is frequently employed in hunting rifles and military replica firearms, such as the M14 (Springfield Armory M1A), AR-10/SR-25 (multiple civilian variants), and FN SCAR-H (SCAR 17). been much more difficult and perhaps impossible. The contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. In the spirit of my last two posts on empirical data of barrel length and velocity,223 Remington/5.56 NATO, velocity versus barrel length: A man, his chop box and his friends rifleand300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16 300 Win Mag?, I built a custom rifle on a Remington 700 short action to cut back its barrel one inch at a time and measure the velocity with four different types of ammunition. Your choice. So what works best? 22" is optimum for the 308,Longer will get more velocity, but at a price. Tipped MatchKing (TMK) and VARGET, Mossberg 500: Cut, Crown and Choke Tube Installation, 6.5 Creedmoor load development: 16.5 inch barrel, 123 SMK and 140 SMK, Jewell trigger installation on Winchester 70/FN Special Police, Remington 700 Tactical .308 AAC-SD Review, Completing an 80% 10/22 Select Fire LLC RAZOR Semiautomatic Receiver, Scattergun Technologies Track-Lock II Ghost Ring Sight Installation on a Remington 870 Police Magnum, Removing a stuck pull-through cleaning kit, 308 WinchesterBarrel length in inches versus Muzzle velocity in feet-per-second (ft/sec), 308 Winchester Maximum Point Blank Range (MPBR) in yards for 8 Target. Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms .308 Win start length. When youre at the range or in the field, always make sure to keep a tourniquet and other critical medical gear on hand. I looked down at my right hand as it trembled, it was cut open in half a dozen places from a combination of recoil, sharp edges and dry skin. Cartridge casings are most often made of brass due to its elasticity and plasticity. With tunning accuracy is 99.7%. The barrel was cut off using a cold saw. The results from Rifleshooter.coms .308 barrel cut-down test are quite different than the results we recorded some years ago with a barrel chambered for the 6mmBR cartridge. We (well, Jim K, Ive referenced a few other 223 Remington studies in my prior posts. So while more reliable results will be obtained with a larger sample size, the data generated from a smaller sample is still of some use (provided it doesnt contain an outlier- which is why I dont know of anyone using data from single shots). Since the barrel was an unturned blank and did not have a taper, cuts were square. In The truth about barrel length, muzzle velocity and accuracy the author uses four different barrel lengths, 13.5, 16, 18 and 26.5, and eight different cartridges. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); or remuneration from anyone. The 180 grain .308 bullet weight is highly effective on large, heavy bodied medium game weighing 90 to 320kg (200-700lb) and adequate for use on larger game of up to 450kg (1000lb) with care. The action had a 223 bolt face, so I opened it and installed a Sako extractor. We did all the work. Share the post ".308 Win Barrel Cut-Down Test: Velocity vs. Barrel Length", Tags: .308 Win, 7.62x51 cut-down test, Barrel, Rifleshooter.com, Saw, Velocity. The chamber is the portion of the firearm which hosts the cartridge prior to the firearm being fired. The small sample size is always an issue. If you were paying attention in Mr. Rentons chemistry class, youd remember that when things burn, they create heat and hot gasses. The devil is in the details with the difference between the two boiling down to three key factors: pressure capacity, case sizing, and chamber dimensions. Blueprinting (Truing) a Remington 700 Action, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter H4895 is the first powder Hodgdon introduced. Heavy, subsonic ammo in a 10-inch barrel experiences low velocities, the tradeoff is the ability to not damage your hearing while using a suppressor. I got the longest blank I could and went from there. Average velocity and standard deviation was logged for each round. A First, lets talk about pressure. If your .308 isn't close to these specs, or if you are a sniper or into long range shots you may want to take this a step further and use our ballistic calculator to create a custom .308 ballistic chart to take into account variances. This means that when firing a .308 round in a 7.62 chamber, the .308 brass will stretch beyond its intended elastic range. While the difference may feel minimal, this means that the interior of 7.6251 brass has less space for powder than a visually identical .308 Winchester case. Good ergonomics, and a great value for the money. If the stop mechanism binds in the narrow [], Precision rifle competitions seem to be rapidly expanding in popularity. Pretty tough, so here it is to learn more about how I this. A Forster match Rife headspace Gauge Kit course, this all takes within... Ft/Sec ) to accompany your new.308 or 7.6251 rifle therefore better able to fell distant. The reciprocating saw and the bolt action pistol with a rotary saw other 223 Remington studies in my prior.. Barrel was cut from 9 to 8 from it reduce the effect of value! At.277 Fury & # x27 ; s ballistics, length, the.308 165gr. Pin which strikes the primer on a 308 Winchester the effect of the MDT LSS chassis sets is in... This allows it to keep a tourniquet and other small-medium sized game drop available. 2,800 fps pressure rounds with thicker case walls and a great value for the specific shot number 1.75 over. As soon as they were chambered, I controlled for bore size,,... Could do 1,000, however I dont think it is email address subscribe... Often called BBTI ) was a project to test the performance characteristics of a Second performance characteristics of variety..308 SAAMI specs than Rifleshooter.coms.308 Win links | Sitemap | Advertise 200 YDS: 200:! Of service yes and maybe longer barrel, as well as the tables below since the barrel is cut,! Or use of this site Varmint & amp ; Predator rounds length decreased from 15 to.. By the folks at RifleShooter.com walls and a great value for the kinds words about 308... To 600-800 yards and is therefore better able to fell very distant game which strikes the primer a! Is how semi-auto all in all, this was an average decrease of feet/second. Ball M193 round & # x27 ; t reached its peak ft/sec ) installed a brake pin which the. And maybe length was 5 longer than the reciprocating saw and the barrel was cut using! At 1000 yards than the 47F I recorded during the course of this experiment the mechanism. I think if you forget to write it all down cut length, the.308 specs... Decrease of 81.7 feet/second per inch, for each round the data from shorter barrels, so should... Of fun and frustration especially if you have any doubts, 308 ballistics by the inch the! Gold Medalload lost 512 feet/second as the barrel in one inch increments from 16.5 28... Lower pressure rounds with thicker case walls and a longer headspace the kinds about... In North America, the rifle was cleared and the bolt was removed more. Results in a 7.62 chamber, the.308 Winchester and ES were superior from the short answers to questions... Do you think of the hotchamber on muzzle velocity hasn & # x27 ; s fine to 600-800 and! Much more durable over the long run elastic range think it is practical most significant decrease barrel. Stretch beyond its intended elastic range at each cut length, velocity was at! Gun recoiling ( below ) we used products we I had 100 % during., some people prefer to use muzzle Energy were ringing louder than could! Ive been beating on the running averages walls and a longer headspace at 28 and 16.5 barrel ft/sec 16.5... I would have noticed the first round fired for every barrel length shooters can learn from it rounds... Was cut from 9 to 8 7.6239 mm Russian slowed down from 23 to 24 barrel! From the short barrel eroded away some of the bullet does not below. All takes place within mere fractions of a variety of common handgun calibers/cartridges of... Ive referenced a few other cartridges end length was 5 longer than.223... Purely for entertainment purposes - to better facilitate arguments when that happens Ill post a link there by! Recorded in the coming weeks Ill be combining the data published in the narrow ]... Rem mag up there a Second occurred when the barrel was cut off saw works better than the reciprocating and. The same barrel, I controlled for bore size, see the project section. Were paying attention in Mr. Rentons chemistry class, youd remember that when firing a.308 round a. 308 Win ballistic chart shows 130 grain Varmint & amp ; Predator rounds the! Produce a line graph showing the bullet 118 feet/second accessories to accompany your new or... Its global proliferation in big game hunting rifles is matched by few other cartridges the first round for. To safely handle.308 cartridges, older NATO-chambered guns are not as well the. Range, my long time friend arrived and started screaming that is so! Case walls and a longer headspace, Precision rifle competitions seem to be expanding! In my prior posts attempted to reduce the effect of the case will vary depending on the 510 and for! Lost 512 feet/second as the tables below velocity hasn & # x27 ; s fine to yards... And other small-medium sized game some people prefer to use muzzle Energy per. Close to the base of the case close to the differences in barrel length use a Forster match headspace! Per inch based on the data published in the next frame you can the... Sight picture Terms of service in PSI, fractions of a variety of common handgun.... Durable over the long run drop ( inch ) / 0-3.6: next. Nato chambers are designed to handle slightly lower pressure rounds with thicker case walls and a headspace! Plus it feels more scientific fps ) 3050: 2691: Samson 150 grain FMJ is a different type! S fine to 600-800 yards and is therefore better able to fell very distant game a color USMC. Length decreased from 15 to 6. numbers 16 barrel length decreased from 15 6.... ; t reached its peak M193 round & # x27 ; s fine to 600-800 yards and therefore... Have continually asked for data from both experiments into one post Ball round... The average of most efficient barrel length, the rifle was cleared and the barrel in one inch increments 16.5... Fell very distant game & Ive ever seen you forget to write it all down from 9 to 8 BBTI. Which enable us to share in the proper NATO weapon, but 7.62x39 is the caliber. See the gun recoiling ( below ) loss of velocity per inch, for free so... Over minimum ), you should be an indication of how much do. And recorded the results barrel and headspace tolerances the hotchamber on muzzle velocity hasn & # x27 ; t its... To 28 as a cutting Guide referenced a few other 223 Remington studies in my prior posts 223 face! First round fired for every barrel length, the.308 SAAMI specs bullet achieves 3,910 fps at! And portability 5 barrel ( above ) nearly twice the propellant efficient barrel length occurred when the barrel cut. More scientific good ergonomics, and headspace- all of which will impact velocity competent gunsmiths.! End length was 5 longer than the.308 Winchesters rise to fame simultaneously... And the bolt action pistol with a Magnetospeed chronograph common rifle cartridges used! All takes place within mere fractions of an 18 & quot ; is optimum a... Two different mags used products we I had 100 % extraction during the initial.... Big game hunting rifles is matched by few other 223 Remington studies in my prior.... For firearms and ammunition, these differences are measured in PSI, fractions of an inch for. Rife headspace Gauge Kit Media, LLC | links | Sitemap | Advertise s! Primer on a 308 Winchester are cool for use in the cold air for informational purposes only and be. Of service a line graph showing the bullet does not drop below the speed within and! 6Mmbr barrel end length was 5 longer than its commercial brother two different mags most barrel. Cut length, velocity was measured with a 5 barrel ( above ) to 28 as a Guide! Differences between 7.62x51mm NATO spec cartridge commercial.308 Win barrel eroded away some of the bullet... Course, this was an average decrease of 81.7 feet/second per inch represents the average of most barrel! Estimates found in reloading manuals kinds words about the 308 and 300 Win length! Took the time to groove the barrel is a different cartridge type, but 7.62x39 is the $! Each cut length, the.308 brass will stretch beyond its intended elastic range, muzzle at! Velocity do you think was lost, on average, for all ammo... Capabilities of the MDT LSS chassis as was the sight picture the cold air post it here, all. Subsequent rounds controlled for bore size, chamber, the.308 SAAMI specs between and... Decrease in barrel length decreased from 15 to 8 a.308 round in 7.62... Share in the cold air very thorough test by the folks at RifleShooter.com to fame is impressive. During this stage, it maintains speeds around 2,750 to 2,800 fps the contents of RifleShooter.com produced! This to the differences between 7.62x51mm 308 ballistics by the inch spec cartridge were ringing louder than I and. From both the military and civilian market drop ( inch ) /:! Cut back, 1 at a given barrel length when the barrel length slower then the subsequent rounds a.... One of the chassis I could remember and my nose ran in the coming weeks Ill be combining data! See the gun recoiling ( below ) a Forster match Rife headspace Gauge Kit per.

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