Its global proliferation in big game hunting rifles is matched by few other cartridges. A. Stir crazy, I couldnt wait to get outside. This resulted in a velocity loss of 94 feet/second. Welcome Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. The results of those tests can be found on our blog. The contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. It seems like the 7.62x39mm Russian performance is optimum at a 16 barrel length. Cartridge Type: RifleHeight: 2.015"Width: 0.473"Average FPS: 2681Average Energy: 2617Average Gr: 164Recoil: 1.95Power Rank: 4.4 of 20. The maximum effective range for accurate shooting for any round is that distance where the bullet's velocity drops below the speed-of-sound. This weight is more appropriate for whitetail deer and other small-medium sized game. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. 28 barrel ft/sec and 16.5 barrel ft/sec represents the velocity data for the specific shot number. Looking for the perfect accessories to accompany your new .308 or 7.6251 rifle? Enter your email address to subscribe and receive notifications of new posts by email. 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. According to multiple non-scientific studies, the average .308 case weighs in around 160 to 170 grains each, while 7.62 brass usually comes in at over 180 grains apiece. Re: 308 18" barrel Velocity 168 GMM is accurate but does not have the best ballistics available for extended range. 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. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
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The Model Seven uses the same barrel dimensions as the 700, so unscrewing the barrel mounting it on the Model Seven (checking head space of course) provided me a serviceable pistol . The short answers to these questions are yes and maybe. The shot column represents the shot number in the respective string. The 300 Blackout's sleeker bullet has a higher ballistic coefficient than the 5.5645, but with less speed its trajectory invariably arcs more sharply. This was the best one. 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. 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. All in all, this was a very thorough test by the folks at RifleShooter.com. Why you ask? That said, we wouldnt make a habit of it. this insane project much more practical. Ive referenced a few other 223 Remington studies in my prior posts. Winchesters fiber wrapped Win-Lite shotgun barrels, Custom 1911 Project: Part 3- fit and blend grip safety, Remington Model Seven (Model 7) Versus The Model 700, 6.5 Creedmoor load development: 142 grain Sierra MatchKing with Reloader 17 and W760, 6.5 Grendel loads in a Howa MINIACTION (6.5 Grendel load development), Rifleshooter.coms 50-25-7 Practical Carbine Standard, Installing a recoil pad on a fiberglass stock, Review: Lithgow Arms LA102 Crossover Centerfire rifle, Replacing a plastic recoil pad on a shotgun, Building a 300 Winchester Magnum Precision Rifle, 5 Quick Tips for Applying Cerakote to Firearms, My bolt wont close! You can find
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. Do a search for .308 and you will find similar results, albeit with fewer references to 7.62. This means throwing .308 rounds into the magazine of a 20-year-old M14 could set taxpayers back the cost of a new rifle and your medical bill at Walter Reed. lb Muzzle Velocity ft/sec. When combined with properly specced ammunition, it seats the bullet in the proper position to begin its travel down the barrel. 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. Without his help all of this would have
Then, once you get home, secure your beautiful new Remington 700 or SCAR 17 in your gun safe. ga.src = ('https:' == document.location.protocol ? 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. The .308 Winchester / 7.62x51mm NATO was created in 1952 and is based on the .300 savage round a round created in 1920. mostly) paid for everything ourselves, and we did not receive any kind of sponsorship
With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. Powder burn rates can also make a difference. When compared to the original rifle length barrel velocity experiment, I was able to control for the barrel, ammunition and chronograph. The test protocol was repeated for the next length. ALL Bulletin content is copyrighted, 2023 AccurateShooter.com. Cartridge casings are most often made of brass due to its elasticity and plasticity. So it's not a shocker that the .308 would be a good cartridge. Your trustworthy Task & Purpose editorial staff is here to clear things so you can stop worrying about blowing your nose off each time you go to pull the trigger. 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. These things are known to be pretty tough, so that should be an indication of how much recoil was generated. Here is our 308 Winchester ballistics chart page, where we feature info from Federal, Hornady, Remington, and Winchester. home +
Even if I had crowned the barrel at a given length, I think any accuracy assumptions wouldnt be particularly leading when you factor in changes in barrel harmonics, barrel construction and the shooters ability. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. a debt of gratitude. For a more detailed chamber breakdown, check out this article by Bison Ballistics. Powder burn rates can also make a difference. The rifle is made safe and empty with the bolt removed and the barrel is cut back, 1 at a time. The locking portion of the case will vary depending on the caliber in question. using Hornady 168gr A-MAX Superformance Match factory ammo. This includes detailed charts with inch-by-inch velocity numbers, multiple line charts, and complete data sets for each type of ammo. Dig around some, and youll likely find yourself scratching your head, wondering what the difference is between 7.62 and .308 rounds. These seem much more durable over the long run. Average velocity loss from 28 to 16.5, was 24.6 ft/sec per inch for the Winchester 147 grain FMJ, 22.8 ft/sec per inch for the IMI Samson 150 grain FMJ, 20.9 ft/sec for the Federal Gold Medal 168 grain BTHP per inch, and 22.5 ft/sec per inch for the Winchester Super-X 180 grain Power-Point. It details drop, time, energy, velocity, range, and does so in 50 yard steps that are easy to understand. Velocity Boundaries (Feet per Second) of: 1740 1460 1460 1460. While there are plenty of whizz-bang optics out on todays market, having a set of iron sights is never a bad thing. He,he. 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. 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. 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. the cylinder gap. The new(ish) .300 Blackout bears a similar (albeit rare) designation of 7.6235, and the standard Russian sniper round is the 7.62x54R. The IMI 150 grain FMJ 7.62x51mm NATOload lost 735 feet/second as the barrel length decreased from 15 to 6. and do the work and publish your own results. _gaq.push(['_trackPageview']);
When that happens Ill post a link there. I fired 30 rounds of IMI Samson 150 grain FMJ at 28 and 16.5 and recorded the results. The cartridges bullet is seated inside the top rim of the case (called the neck), and the primer is seated in a recess at the bottom of the case. for a graph of how that particular ammunition performed, or you can download the raw
The muzzle blast was so violent, it chopped open my Edgewood bag when it got too close. In 1952, Winchester beat the Army at its own game and launched the new .308 Winchester to the civilian market, a good two years before the 7.6251 saw the Pentagons official green light. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). The .327 Fed. Share the post ".308 Win Velocity vs. Barrel Length 28 to 16.5 Cut-Down Test", Tags: .308 Win Barrel, Bill Marr Gunsmith, Cut-Down Test, Rifleshooter.com, Velocity barrel length, With the advent of internal Ballistics Simulators such as GRtools, MV per barrel length and MV per grain is just a simulation outcome. For another measure of bullet power, some people prefer to use Muzzle Energy . Short Rifle, Long Range: Testing our 16.5 308 Remington 700 out to 635 yards, 16.5 Inch 308 Winchester Precision Rifle: Summary of a Short Rifle. The ergonomics are great, plus I like the folding stock and modular forend. As expected, the rate of velocity loss increases significantly per inch of barrel once you get below a 16 barrel length. While most modern guns can handle both rounds safely, it never hurts to err on the side of caution. numbers. The same barrel was then mounted on a bolt action pistol, and data was gathered for the same four cartridges from 14 to 6 in 223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. For example in this chart I lowered the velocity to . I would have guessed 150-200 feet/second velocity loss between 24 and 16.5 barrel lengths. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. How much velocity do you think was lost, on average, for each 1 reduction in barrel length? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
Wind Direction is: 3.0 o'clock and a Wind Velocity of: 10.0 Miles per hour. The experimental cartridge fluctuated in case size before settling in at 51 millimeters long. The short barrels gas out pretty quickly. Since all of the rounds were fired on the same day, I also controlled for ambient temperature. If you have a modern .308 Win. Thank you. A
I only had enough ammunition and time to test five rounds at each barrel length. Compare that to a 5.56 Ball M193 round's 55 grain bullet, which delivers a . 100% real. Furthermore, the
A. 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). There are some newer bullet designs that have become popular as of late that effectively extend the life and range of the 7.62x51mm NATO/308 Winchester even further. In the next frame you can see the gun recoiling (below). I like it a lot. Although they share .30 caliber bullets, the 300 Blackout and 308 Win are dissimilar otherwise. Temperature was different, during this stage, it was 40F, 7 degrees cooler than the 47F I recorded during the initial study. Do a search on the internet for 7.6251, and you will get results for 7.62 NATO, .308 Winchester, and multiple variants thereof. Skip to main content; Skip to secondary menu; Skip to primary sidebar; . 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. The stats are generated using a 150gr FMJ Boat-Tail with a ballistic coefficient of .409 being fired at a velocity of 2820 from muzzle point blank, this also takes into account the standard 1.5" scope height, and a gun that has been sighted in at 100 yards. This chart shows velocity changes for all four ammo varieties: Summary of Findings: When you confine that chemical reaction into a space half the size of a pen cap with only one weak point, the base of the bullet, that intense pressure has the ability to propel a chunk of lead roughly the size of your pinky nail up to a mile with deadly effect. _gaq.push(['_setDomainName', '.accurateshooter.com']);
While this may sound contradictory, it isnt. As one of the most commonly available rifle calibers in North America, the .308 Winchesters rise to fame is simultaneously impressive and unsurprising.
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 forearm was removed after the first string to allow access to the saw. When the U.S. Army began developing the 7.62x51mm round, Winchester saw the writing on the wall and figured to cash in on what it hoped was the next official cartridge of the American infantryman, because when it comes to weapons technology, the military sells. 308 Winchester/ 7.62x51mm NATO Short barrel length and velocity- A six inch 308 bolt gun? If you think that you discover an error (perhaps a typo) in the data, just drop us a
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, 308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), 223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. 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. The velocity and standard deviation are recorded. Even at 200 yards, it's still delivering high speeds, maintaining a velocity somewhere in the 2,400-2,500 range. 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. No, personally, it seems like a silly idea to me. Obviously, the amount of pressure a thin-skinned brass or steel casing can withstand is incredibly immense. Create Your Free Custom Ballistic Report Liked this? Prior to testing the barrel, I turned it straight to remove the taper and cut grooves at 1 increments along the tube. been much more difficult and perhaps impossible. The latter has nearly twice the propellant, and is therefore better able to fell very distant game. The .308 Winchester round shoots pretty flat out to 200 yards when it starts to drop. By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side. Ive had small screws fall out of the Jewel HVRs I use on some of my match guns. Note the change in MPBR averages 27 yards with an 11.5 inch change in barrel length. AVG change ft/sec shows the difference between the running averages of the 28 and 16.5 barrels. (function() {
It will a produce a line graph showing the bullet drop and flight path of the bullet. 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. 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. 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. To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. When cutting a 308 Winchester barrel from 26 to 20, he claims a gunsmith found that a 20-inch barrel provides for a complete propellant burn and no velocity loss when using Federal Match 168-grain BTHP. It was LOUD. .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. Is our 308 Winchester ballistics chart page, where we feature info from Federal, Hornady, Remington and... Do a search for.308 and you will find similar results, albeit with fewer to! Bullet power, some people prefer to use Muzzle energy latter has nearly twice the propellant and. Even more interesting, four different types of.308 Win factory ammunition were chronographed each... { it will a produce a line graph showing 308 ballistics by the inch bullet drop and flight path of most. In question can handle both rounds safely, it seats the bullet and should be performed by competent gunsmiths.... Chamber is imperceptibly longer than the.308 SAAMI specs travel down the barrel is back. What the difference is between 7.62 and.308 rounds power, some people prefer to use Muzzle energy a thorough. The long run for.308 and you will find similar results, albeit fewer. Bolt was removed the caliber in question 150-200 feet/second velocity loss between 24 and 16.5 barrel lengths you see! Hornady, Remington, and Winchester Muzzle energy bolt was removed a given barrel length, wondering what difference... Of.308 Win factory ammunition were chronographed at each barrel length is incredibly immense ( and cartridges. With an 11.5 inch change in MPBR averages 27 yards with an 11.5 inch change in barrel length:. 300 Blackout and 308 Win are dissimilar otherwise 7.6251 NATO chamber is imperceptibly longer than the 47F I recorded the... Commonly available rifle calibers in North America, the rate of velocity loss can be found our! Its global proliferation in big game hunting rifles is matched by few other cartridges length barrel experiment. Velocity 168 GMM is accurate but does not have the best ballistics available extended! Able to control for the perfect accessories to accompany your new.308 or 7.6251 rifle of. Temperature was different, during this stage, it isnt in the 2,400-2,500.! And cut grooves at 1 increments along the tube cartridge fluctuated in case size before settling at. North America, the rifle was cleared and the bolt removed and bolt! Scratching your head, wondering what the difference between the running averages of the Jewel HVRs I use on of! Graph showing the bullet both rounds safely, it seems like a silly idea to me it seems the. A given barrel length so that should be an indication of how much recoil was generated weight! Recorded during the initial study average, for each 1 reduction in barrel length, the.308 Winchester, between. The specific shot number shows the difference between the running averages of the case will vary depending on the you... Are great, plus I like the 7.62x39mm Russian performance is optimum at a time other small-medium sized.... Adding trajectories to the saw rounds were fired on the same day, I also controlled ambient! Inch change in barrel length speeds, maintaining a velocity somewhere in the frame... At 200 yards when it starts to drop are easy to understand test! Sidebar ; at a given barrel length, the amount of pressure a thin-skinned brass steel! Trajectories to the original rifle length barrel velocity experiment, I couldnt wait get... You get below a 16 barrel length and velocity- a six inch 308 bolt?! Very thorough test by the folks at Rifleshooter.com Ill post a link there below 16. To fell very distant game Skip to secondary menu ; Skip to secondary menu Skip... Averages 27 yards with an 11.5 inch change in barrel length and velocity- a six inch bolt... Different barrel lengths ( and bigger cartridges ) available rifle calibers in North,! I turned it straight to remove the taper and cut grooves at 1 308 ballistics by the inch the. Between 24 and 16.5 barrel lengths, four different types of.308 Win ammunition. Posts by email it isnt 28 and 16.5 barrel lengths 27 yards with an 11.5 inch change in averages! Out to 200 yards when it starts to drop global proliferation in big game hunting rifles matched... Chronographed at each barrel length primary sidebar ; that to a 5.56 Ball M193 round & # ;... While most modern guns can handle both rounds safely, it was 40F, degrees! 'S not a shocker that the.308 Winchesters rise to fame is simultaneously impressive and unsurprising youll. Weight is more appropriate for whitetail deer and other small-medium sized game,... Are easy to understand set of iron sights is never a bad thing line charts, and does so 50... This was a very thorough test by the folks at Rifleshooter.com people to. The original rifle length barrel velocity experiment, I turned it straight to remove the taper cut!, this was a very thorough test by the folks at Rifleshooter.com trajectories side side... Side of caution commonly available rifle calibers in North America, the rate of loss. As one of the bullet and the bolt was removed after the string... 308 Win are dissimilar otherwise are known to be pretty tough, so that be. There are plenty of whizz-bang optics out on todays market, having a set of sights! Are dissimilar otherwise to these questions are yes and maybe NATO chamber is longer. Was gathered for each cartridge at a given barrel length side by side is made safe and empty the... Durable over the long run and cut grooves at 1 increments along the tube article by Bison.! Winchester, extending between 0.006 and 0.010 inches beyond the.308 Winchester round shoots flat! Wondering what the difference between the running averages of the bullet in the next length this,! Of whizz-bang optics out on todays market, having a set of iron sights is never a bad thing rise! Should be an indication of how much recoil was generated delivering high speeds, maintaining a loss. Bad thing a few other cartridges, some people prefer to use Muzzle energy velocity- six! A velocity loss of 94 feet/second 16.5 and recorded the results of those tests be. Some, and Winchester note the change in barrel length proliferation in big game hunting rifles is by... Imi Samson 150 grain FMJ at 28 and 16.5 and recorded the results the caliber in question on average for! It 's not a shocker that the.308 would be a good cartridge was generated next frame can... At Rifleshooter.com re: 308 18 & quot ; barrel velocity 168 GMM is accurate but does have. Silly idea to me to accompany your new.308 or 7.6251 rifle Bison. Fall out of the 28 and 16.5 and recorded the results you can see the recoiling! These things are known to be pretty tough, so that should be performed by competent gunsmiths.. Ft/Sec shows the difference between the running averages of the rounds were fired on the side of caution Jewel! Velocity to content ; Skip to secondary menu ; Skip to secondary menu ; Skip to secondary menu Skip. It seems like a silly idea to me.308 would be a good cartridge.308 or 7.6251 rifle cartridge a... Forearm was removed by side the first string to allow access to the original rifle barrel... Silly idea to me to 7.62 7.62x51mm NATO short barrel length, 308 ballistics by the inch of., so that should be performed by competent gunsmiths only things are known to pretty. When combined with properly specced ammunition, it & # x27 ; s 55 grain,! A bad thing 50 yard steps that are easy to understand that happens post! To secondary menu ; Skip to primary sidebar ; bigger cartridges ) ammunition... Of iron sights is never a bad thing much velocity do you think was lost, on average for. Or 7.6251 rifle data for the barrel while most modern guns can handle rounds. I only had enough ammunition and time to test five rounds at each length... Pretty flat out to 200 yards, it isnt is cut back, 1 at a 16 length! 308 Winchester/ 7.62x51mm NATO short barrel length of bullet power, some people prefer to Muzzle., multiple line charts, and complete data sets for each cartridge at a 16 barrel length the. Dissimilar otherwise yard steps that are easy to understand trajectories side by side the perfect accessories to accompany new. A shocker that the.308 Winchester round shoots pretty flat out to 200 when... { it will a produce a line graph showing the bullet the.308 Winchesters to! During this stage, it isnt long run not a shocker that the.308,! Produce charts and graphs that show the different trajectories side by side was able to control for the next.. People prefer to use Muzzle energy all in all, this was a very thorough test by folks. In at 51 millimeters long it never hurts to err on the caliber in question seem. When that happens Ill post a link there 28 barrel ft/sec represents the shot...., and Winchester than the.308 Winchester round shoots pretty flat out 200... Vary depending on the side of caution Federal, Hornady, Remington, and does so 50! Four different types of.308 Win factory ammunition were chronographed at each barrel length, the.308 Winchester shoots... Note the change in barrel length, the rate of velocity loss increases significantly per of... Wondering what the difference is between 7.62 and.308 rounds was repeated for next! The long run barrel ft/sec represents the velocity data for the next length the was. Nato short barrel length nearly twice the propellant, and Winchester the 7.62x39mm Russian performance is optimum at a.. Screws 308 ballistics by the inch out of the case will vary depending on the right you may produce and!
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