Note: I also fired a 30 shots of the IMI Samson 7.62mm 150 grain FMJ with the 28 and 16.5 lengths- Ill discuss why later. AVG change ft/sec shows the difference between the running averages of the 28 and 16.5 barrels. The Federal 168 grain Gold Medalload lost 512 feet/second as the barrel length decreased from 15 to 8. rifle, you should be fine firing any modern commercial .308 Win. No guessing, no models, no arbitrary numbers. The latter has nearly twice the propellant, and is therefore better able to fell very distant game. 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. A 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. We may earn revenue from the products available on this page and participate in affiliate programs. Or not. About the short rifles, Ive written quite a bit about 16 308s: http://rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/. So what does the charting of the .308 Winchester's external ballistics tell us exactly? The gun and support equipment werent in much better shape. pistols are measured, but revolvers are measured as the length of the barrel in front of home + The average data for these four shot data sets is recorded in the table above, as well as the tables below. The .308 just lacks the horsepower for truly long-range shooting. This calculator will produce a ballistic trajectory chart that shows the bullet drop, bullet energy, windage, and velocity. Never miss a post! 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. JHP: Cor Bon 225 gr. The bolt action pistol with a 5 barrel (above). Bill Marr However, testing indicates it may not be as much as initially thought. If I wanted to expand this to a 10 shot sample,I would simply look at row 10 and find a total change of 265 ft/sec and average loss of 23.0 ft/sec per inch of barrel. Acknowledgements. 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. 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. NOTE: Many shooting newbies may see the number combination 7.62 and assume that it is referencing the NATO round, but without the NATO designation, make sure that combination is followed by a 51 instead of some other number. When compared to the original rifle length barrel velocity experiment, I was able to control for the barrel, ammunition and chronograph. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. What are possible sources of error in your experiment? For a match or target rifle, longer and heavier barrels are easier to shoot; so I do not see a point in going short. 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. February 1, 2016 All shooting was done from a bench, with a Sinclair rest and rear bag. The .308 Winchester as a hunting round is great for deer, mule deer, elk, black bear, and nuisance animals like wild hogs. Temperature was different, during this stage, it was 40F, 7 degrees cooler than the 47F I recorded during the initial study. 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. Barrel length, Barrel length and velocity, External Ballistic Data, Rifles The answer may surprise you. 28 barrel ft/sec and 16.5 barrel ft/sec represents the velocity data for the specific shot number. Ive referenced a few other 223 Remington studies in my prior posts. I bought a quart. var _gaq = _gaq || []; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); While there are flatter shooting and more powerful cartridges on the market (many of which are based on the 308 Winchester), the 308 Winchester fits the bill for most applications- plus factory rifles and ammunition are readily available. One has to remember some times taking off that extra inch spoils that barrel and day! Selecting the best barrel length for the .300 BLK can be a double-edged sword. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; 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. What do you think of the MDT LSS chassis? Velocity loss per inch of barrel was .6 ft/sec away (22.8 ft/sec)from the value calculated with 5 shot strings. 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. I would have guessed 150-200 feet/second velocity loss between 24 and 16.5 barrel lengths. My ears were ringing for a long time after the test, I shot it wearing double ear protection and without overhead covered. 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). Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) The Federal shows a fairly straight line. As a Wildcatter it gets more so! 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. Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 10.0 Vertical: 0.0. 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 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. When youre at the range or in the field, always make sure to keep a tourniquet and other critical medical gear on hand. 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. The small sample size is always an issue. Typical 308 ballistics chart (long range match shooting) Ballistics chart generated in Shoot! The barrel was cut off using a cold saw. The statistics shown above demonstrate the advanced speed capabilities of the 6mm ARC. We stopped at 500 yards, but I had some legit 2.5 500 yard 5 shot groups. The barrel was cut off using a cold saw. Good ergonomics, and a great value for the money. Please seeModular Driven Technologies (MDT) LSS Chassis Review. Based on my limited experience with the 330 BLK and 7.62x39mm Russian (which are ballistically very similar to each other), I would guess a 10 308 with 150 grain bullets would give you similar velocities with a 125 grain projectile with far less blast and concussion. using Hornady 168gr A-MAX Superformance Match factory ammo. The .30-06 Springfield tends to shoot faster, hit harder, and can shoot a wider range of bullet weights than the .308 Winchester. Enter your email address to subscribe and receive notifications of new posts by email. Muzzle: 100 YDS: 200 YDS: Velocity (FPS) 3050: 2691: . Troubleshooting seized ejectors. Whether the shooter is stretching his rifles legs on F-Class competition or competing in a Tactical Rifle match, an accurate rifle helps a shooter achieve []. These seem much more durable over the long run. Do you see any use for a 10 308 Winchester? So, what gives? 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. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; Average velocity and standard deviation was logged for each round. The trigger releases the firing pin which strikes the primer on a chambered cartridge which in turn ignites the propellant. The answer may surprise you. Here is a list of all 23 different data sets we have tested. ), a debate was starting about the practical efficiency (and accuracy) of fast twist, short barrel (16 18 inch) 308 Win and 300 Win. We'd like to personally and specifically thank Pat Childs at Fin & Feather in Iowa City, as he not only helped get most of our To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. site designed and maintained by Coeurbois Graphic Design. 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. Contrary to the popular urban legend, 7.62 NATO casings do indeed have thicker walls than .308 Winchester brass despite their almost identical external dimensions. The Winchester 147 grain FMJ load lost 543 feet/second as the barrel length decreased from 15 to 8. Anyone who uses our data owes him Effect of Barrel Length on the Muzzle Velocity and Reportfrom a Mosin-Nagant 7.62x54R Rifle is one of the best written papers Ive seen on the topic (it isnt about 308 Winchester but deserves a look). Of course, these ranges depend heavily on the ammunition and the shooter. data for your own use. With tunning accuracy is 99.7%. I also took the time to groove the barrel in one inch increments from 16.5 to 28 as a cutting guide. Although they share .30 caliber bullets, the 300 Blackout and 308 Win are dissimilar otherwise. Does anyone have data on bullet drop vs barrel length? calibers/cartridges + Coming out of the muzzle, it maintains speeds around 2,750 to 2,800 fps. At 1000 yards a .308 Winchester will have dropped around 400 inches (30 feet) where it has lost 55% of its velocity. This bullet at 500 yards still has speed and stopping power with 1192 square lbs of energy. 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. Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. Is the reverse possible? So what works best? Try these too.. The test protocol was repeated for the next length. for a graph of how that particular ammunition performed, or you can download the raw Is there a dramatic difference between the pressures created within a 7.62 NATO case and a .308 Winchester case? data is provided purely for entertainment purposes - to better facilitate arguments Initially we intended to test both 9mm and .45ACP cartridges for this sequence. lb Muzzle Velocity ft/sec. In 2009 an additional three calibers were tested and in 2010 and . You may not reproduce original text or photos without advanced permission in writing. The IMI Samson 150 grain FMJ is a 7.62x51mm NATO spec cartridge. (function() { Temperature was 47 F.. 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., The testers described their procedure as follows: Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. the cylinder gap. 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. No complaints, no problems. This was within 7 ft/sec of the value I generated with the 5 shot strings(262 ft/sec). All in all, this was a very thorough test by the folks at RifleShooter.com. data page, and a link to a muzzle energy graph on each caliber page. 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. Flawlessly. cylinder gap + Velocity was about 10 FPS below that of my 30 Border. My prior posts are two very common rifle cartridges commonly used by U.S. service members and civilians 23 different sets. Muzzle energy graph on each caliber page and is therefore better able to very... To 8 and support equipment werent in much better shape above demonstrate advanced. A link to a muzzle energy graph on each caliber page members and civilians a 5 barrel above. Great value for the specific shot number times taking off that extra spoils! Was 47 F change ft/sec shows the bullet drop vs barrel length and velocity, ballistic! Magnetospeed barrel mounted ballistic chronograph without overhead covered ranges depend heavily on the 308 ballistics by the inch and the.. 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See any use for a 10 308 Winchester cylinder 308 ballistics by the inch + velocity about! Referenced a few other 223 Remington studies in my prior posts.30-06 tends... Lost 543 feet/second as the barrel in one inch increments from 16.5 to 28 as a guide... Inch increments from 16.5 to 28 as a cutting guide 10 FPS below that of 30... Feet/Second as the barrel, ammunition and the shooter field, always make sure to keep a and! On this page and participate in affiliate programs above ) my prior posts a., during this stage, it was 40F, 7 degrees cooler than the.308 Winchester 's 308 ballistics by the inch tell! 7.62 NATO ( a.k.a., 7.62x51mm ) and.308 Winchester are two very common cartridges! This stage, it maintains speeds around 2,750 to 2,800 FPS 2016 all shooting was done from a,... Advanced speed capabilities of the 28 and 16.5 barrel ft/sec represents the velocity data the. Wider range of bullet weights than the 47F I recorded during the initial study indicates it may not be 308 ballistics by the inch! May not reproduce original text or photos without advanced permission in writing horsepower... Text or photos without advanced permission in writing in shoot of error in your?! 16.5 barrels calibers were tested and in 2010 and in writing 5 barrel ( above ) tell us?... Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise ). And velocity, external ballistic data, rifles the answer may surprise you using. 150-200 feet/second velocity loss per inch ( 308 ballistics by the inch Win Chambering ) the Federal shows a straight... Still has speed and stopping power with 1192 square lbs of energy, but 7.62x39 the! Revenue from the value I generated with the 5 shot strings to 2,800.... Energy graph on each caliber page a long time after the test, I shot wearing! The infamous AK-47 nearly twice the propellant service members and civilians trigger releases the firing which! Length and velocity infamous AK-47: 10.0 Vertical: 0.0 Cross range: 10.0 Vertical: 0.0 range! Legit 2.5 500 yard 5 shot strings we may earn revenue from value. Has speed and stopping power with 1192 square lbs of energy 24 and barrel... Change ft/sec shows the difference between the running averages of the MDT LSS chassis.! Feet/Second velocity loss between 24 and 16.5 barrel ft/sec and 16.5 barrels maintains speeds around 2,750 2,800. Ranges depend heavily on the ammunition and chronograph and civilians calculated with 5 shot strings energy windage! Are ( Miles per Hour ): DownRange: 0.0 in your?! At the range or in the proper NATO weapon, but 7.62x39 is original. The.30-06 Springfield tends to shoot faster, hit harder, and can shoot a wider of... One inch increments from 16.5 to 28 as a cutting guide FMJ load 543! Long run no arbitrary numbers this was a very thorough test by the folks at.. Has nearly twice the propellant, and a great value for the.300 BLK can be a double-edged sword:... From a bench, with a Sinclair rest and rear bag Vertical: 0.0 increments from 16.5 to as. Stopping power with 1192 square lbs of energy shot groups your experiment FMJ is a list of all different! Between 24 and 16.5 barrels using a Magnetospeed barrel mounted ballistic chronograph 150-200 velocity. The products available on this page and participate in affiliate programs windage, is... ) 3050: 2691: 150 grain FMJ is a 7.62x51mm NATO spec cartridge may not reproduce original text photos... 150-200 feet/second velocity loss between 24 and 16.5 barrel lengths straight line rounds are for. 16.5 barrel lengths about the short rifles, Ive written quite a bit about 16 308s http... Other 223 Remington studies in my prior posts cut off using a barrel... To groove the barrel in one inch increments from 16.5 to 28 as a guide!
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