The rifle was chambered with a SAAMI specification 308 Winchester reamer made by Dave Manson. Nearly every target shooter had his teeth cut on a 308 Winchester. For instance, when calculating maximum point blank zero for a 8 target, the projectile will never rise more than 4 above the line of sight or fall 4 below it. As one of the most commonly available rifle calibers in North America, the .308 Winchesters rise to fame is simultaneously impressive and unsurprising. He declined. In fact the .308 Winchester 165gr bullet is traveling faster at 1000 yards than the .223 or 7.62x39mm at just 500 yds. on each to just browse the charts, click on a given ammunition type listed in the header of each chart My 22 308 Winchester (above) is my favorite rifle to shoot. It is outside the scope of this post. Based on the data published in the Rifle Shooter article, the average of most efficient barrel length is 21.7 inches. var _gaq = _gaq || []; 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. A heavier bullet delivers greater energy upon impact at the expense of faster bullet drop which is nothing skilled . At the urging of the federal government, the Small Arms and Ammunition Manufacturers Institute (SAAMI) was founded in 1926 as an association of the nations leading manufacturers of firearms, ammunition and components. The organization is tasked with creating, standardizing, and publishing technical firearms and ammunition data in order to promote quality, reliability, interchangeability, and safety within the firearms manufacturing and shooting communities. .357 SIG, .38 Super Auto Colt, .35 Whelen, .300 Remington Ultra Magnum, .35 Remington, .44 Smith & Wesson Special, .380 Auto (9mm Browning Short), 10mm Auto, .25 Winchester Super Short Magnum (WSSM), .303 British, 6.5x54 MS (6.5 Mannlicher-Schoenauer), .300 Remington Short Action Ultra Magnum, .218 Bee, 6.8mm Remington SPC, .25-20 Winchester. After 15 years Im still working it out. Average velocity and standard deviation were logged for each round. The most significant decrease in barrel length occurred when the barrel was cut from 9 to 8. Contact the author here. We selected an 8 MPBR for comparison purposes, since this was the same size vital area we used for the 300 Winchester Magnum and 223 Remington barrel length articles. Would be more interesting to see maybe 35 barrel down to 28 Have always heard that barrels quit increasing in velocity after 34. The action had a 223 bolt face, so I opened it and installed a Sako extractor. 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. Here are some pics: I get this every so often. When we cut our 6mmBR barrel down from 33 to 28, we only lost about 8 FPS per inch. The velocity and standard deviation are recorded. 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. 22" is optimum for the 308,Longer will get more velocity, but at a price. Note the change in MPBR averages 27 yards with an 11.5 inch change in barrel length. For more on sample size, see the discussion here. This was an average decrease of 73.1 feet/second per inch of barrel length. Acknowledgements. 28 barrel ft/sec and 16.5 barrel ft/sec represents the velocity data for the specific shot number. American Eagle (Federal) Full Metal Jacket Boat-Tail, 150gr. This includes detailed charts with inch-by-inch velocity numbers, multiple line charts, and complete data sets for each type of ammo. The rifle is made safe and empty with the bolt removed and the barrel is cut back, 1 at a time. To learn more about the LSS and other MDT products, click here to visit their website. CLICK HERE to Read the Rifleshooter.com Test. This weight is more appropriate for whitetail deer and other small-medium sized game. For a match or target rifle, longer and heavier barrels are easier to shoot; so I do not see a point in going short. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; While 7.62 NATO and .308 Winchester look identical, like twins, if you know what to look for, you can start to tell them apart. . Click on each to just browse the charts, click on a given ammunition type listed in the header of each chart for a graph of how that particular ammunition performed, or you can download the raw data for your own use. While you can get close estimates to anticipated velocities by examining anecdotal accounts from different shooters and looking over load manuals, the data gathered in an actual experiment provides a baseline that can help inform your decision making process. Anyone who uses our data owes him For more information on headspace, check out Oleg Volks excellent write-up at Cheaper Than Dirt. This was within 7 ft/sec of the value I generated with the 5 shot strings(262 ft/sec). was measured from the end of the barrel back to the breech face. 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. This bullet at 500 yards still has speed and stopping power with 1192 square lbs of energy. The PowerRank is an estimation of the cartridge power. The rifle was built with the following parts ordered fromBrownells: Brownells also provided the four types of ammunition used in this test: I did not true (blueprint) the action prior to threading and chambering the barrel. 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. Tolerance is the acceptable degree of variance a manufacturer will allow for a product to meet quality standards. The Federal Gold Medal 168 grain BTHP is ubiquitousin match and law enforcement usearound the world (I wasnt able to get enough 175 grain Gold Medal for the test). The test protocol was repeated for the next length. The experimental cartridge fluctuated in case size before settling in at 51 millimeters long. Gold Dot Short-bbl HP: Henry Big Boy 20" barrel: 1555: 1527: 1613 This chart shows velocity changes for all four ammo varieties: Summary of Findings: Ive referenced a few other 223 Remington studies in my prior posts. 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 $175benchrest bag. A. The .308 just lacks the horsepower for truly long-range shooting. Published Mar 29, 2021 12:55 PM EDT. This could have some potentially expensive consequences. The rifle with a shorter barrel was louder. This was the best one. The Army wanted a new rifle caliber with performance comparable to the proven .30-06 but with a shorter overall length, a new wonder cartridge. If you have a modern .308 Win. With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. A. The results from Rifleshooter.coms .308 barrel cut-down test are quite different than the results we recorded some years ago with a barrel chambered for the 6mmBR cartridge. The testers described their procedure as follows: Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. using Hornady 168gr A-MAX Superformance Match factory ammo. tweet/email or post a comment on the blog - one of us will double-check the original As noted in the 223 short barrel experiment, as the barrel length decreases, the chronograph will sometimes fail to record a shot. That is actually not correct. The brand new, factory AI AICS magazine also flew apart as few times. The barrel was cut off using a cold saw. *Casing image above is an artist rendering and not a real photo of .308 Winchester (7.62mm NATO) Ballistics cartridge. For another measure of bullet power, some people prefer to use Muzzle Energy. The thing I found most interesting , is the lines show the consistency of the ammunition ! Before I left the range, my long time friend arrived and started screaming that is the %$#& Ive ever seen. 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. ALL Bulletin content is copyrighted, 2023 AccurateShooter.com. With barrels, one wonders Can a little more length provide a meaningful velocity gain? To answer that question, Rifleshooter.com performed an interesting test, cutting a .308 Win barrel from 28 all the way down to 16.5. 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. Headspace is the distance between the base of a case and the portion of the case that locks the entire cartridge into place within the chamber. Dig around some, and youll likely find yourself scratching your head, wondering what the difference is between 7.62 and .308 rounds. With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. I shook vigorously from head to toe. At each cut length, velocity was measured with a Magnetospeed chronograph. 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. Are 7.62 NATO (a.k.a. This was noticeable from 19 inches and below. I offered to let him shoot it. 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. 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. Troubleshooting seized ejectors. The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. Please seeModular Driven Technologies (MDT) LSS Chassis Review. This was an average decrease of 77.6 feet/second per inch of barrel length. So, what gives? The rifle is fine. Typical 308 ballistics chart (long range match shooting) Ballistics chart generated in Shoot! The Winchester 180 grain Power-Point load lost 364 feet/second as the barrel length decreased from 15 to 9. This allows it to keep a supersonic muzzle velocity at 1,000 yards. How to Sight in a Scope - Step by Step Guide. Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms .308 Win start length. Besides the time, I havent noticed any burrs (real or imagined) left by the saw affecting the velocity of the bullets. 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 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. 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. SDs and ES were superior from the longer barrel, as was the sight picture. When you pull the trigger on your M14, it starts a chain reaction. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var _gaq = _gaq || []; I post it here, for free, so other shooters can learn from it. What makes the .308 such a good round? Ballistic Trajectory Calculator Ballistic Coefficient Calculator Since we first launched BBTI in November of 2008, it has become a primary reference tool for firearms enthusiasts of all stripes and from around the globe. Enter your email address to subscribe and receive notifications of new posts by email. Increasing this sample size would increase the reliability of these results. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. The .308 Winchester round shoots pretty flat out to 200 yards when it starts to drop. Barrel length, Barrel length and velocity, Cartridge Selection Is there a dramatic difference between the pressures created within a 7.62 NATO case and a .308 Winchester case? 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. Of course, these ranges depend heavily on the ammunition and the shooter. It's fine to 600-800 yards and is fine at that range out of an 18" barrel. No complaints, no problems. The chops tests ranged in barrel length from 18" down to 3". Lots of fun and frustration especially if you forget to write it all down! Why you ask? a debt of gratitude. Last week I found out Cerakote has a color called USMC Red. This was with Varget powder. 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. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); Yes, I am very impressed. 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. By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side. Articles may contain affiliate links which enable us to share in the revenue of any purchases made. Powder burn rates can also make a difference. This results in a ruptured case which can cause significant damage to your magazine, chamber, and/or person. 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. cylinder gap + In the coming weeks Ill be combining the data from both experiments into one post. Rifleshooter.com and its authors, do not assume any responsibility, directly or indirectly for the safety of the readers attempting to follow any instructions or perform any of the tasks shown, or the use or misuse of any information contained herein, on this website. We (well, Jim K, If you think that you discover an error (perhaps a typo) in the data, just drop us a At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. 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). 308 Winchester: BBA JHP: 175: 2832: 2700: 308 Winchester Good ergonomics, and a great value for the money. Muzzle flash with the IMI Samson 150 grain FMJ was noticeably worsefrom 18 and below. ALL Bulletin content is copyrighted, 2023 AccurateShooter.com. ammunition and other supplies, he was the brilliant gunsmith who worked with us to make By using the same barrel, I controlled for bore size, chamber, and headspace- all of which will impact velocity. If youve never slugged a bore (pushed a soft lead bullet through a barrel) you should, you would be surprised by the variations you can detect in the barrel. So it's not a shocker that the .308 would be a good cartridge. The ergonomics are great, plus I like the folding stock and modular forend. The barrel length for a 308 can be anywhere from 16 to 24 inches, while the barrel length for a AK-47 in caliber is typically 16 inches. Its global proliferationin big game hunting rifles is matched by few other cartridges. No, I did not. However, testing indicates it may not be as much as initially thought. 308 Winchester/ 7.62x51mm NATO Comparison of velocity data. While this may sound contradictory, it isnt. Stir crazy, I couldnt wait to get outside. 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. Its global proliferation in big game hunting rifles is matched by few other cartridges. These things are known to be pretty tough, so that should be an indication of how much recoil was generated. numbers. Is the file picture at the top of the page real, or photoshopped? 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). At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. The .308 Winchester / 7.62x51mm NATO was created in 1952 and is based on the .300 savage round a round created in 1920. | The IMI 150 grain FMJ 7.62x51mm NATOload lost 735 feet/second as the barrel length decreased from 15 to 6. The test protocol was repeated for the next length. 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. The most significant decrease in barrel length occurred when the barrel was cut from 10 to 9. I think cutting the same barrel is preferable over comparing different barrels of different lengths. It fires a .312-inch-diameter bullet as opposed to a .308-inch-diameter bullet and operates at 45,000 psi as opposed to 40,000. Just ask Todd Hodnett. With barrels, one wonders Can a little more length provide a meaningful velocity gain? To answer that question, Rifleshooter.com performed an interesting test, cutting a .308 Win barrel from 28 all the way down to 16.5. 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. It was LOUD. Selecting the best barrel length for the .300 BLK can be a double-edged sword. While there are plenty of whizz-bang optics out on todays market, having a set of iron sights is never a bad thing. the cylinder gap. The bolt action pistol with a 5 barrel (above). Drop (Inch) / 0-3.6: Our next 308 Win ballistic chart shows 130 grain Varmint & Predator rounds. Very well. This means that when you pull the trigger, 7.6251 brass expands less outwardly but farther toward the chamber. Cases are most often made with brass but may occasionally be made with steel or receive a nickel-plated finish. Flawlessly. Like the 5.56 versus .223 comparison, understanding the differences between 7.6251 NATO and .308 Winchester is an exercise in patience that has the potential to save you and your wallet some pain and agony. Notice the rounds have similar external ballistics with the different barrel lengths out to 500 yards, past 500 the differences become significant. Do you trust the results from the MagnetoSpeed? Great test ! 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. With modern materials and powders, it would be great to see whether a 300 Win Mag on a short barrel could be made to group out to 1000 yards. Is the reverse possible? 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! More about the LSS and other small-medium sized game is traveling faster at 1000 yards than.223! The Sight picture by the saw affecting the velocity data for the specific shot.. 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Of barrel length decreased from 15 to 9 of ammo for whitetail deer other. % $ # & Ive ever seen within 7 ft/sec of the length. For more on sample size, see the discussion here in velocity after 34 adding trajectories to the panel the... Deer and other small-medium sized game velocity, but at a given barrel length is 21.7 inches breech.... And operates at 45,000 psi as opposed to a.308-inch-diameter bullet and operates at 45,000 psi as opposed to.308-inch-diameter! From both experiments into one post the trigger on your M14, it starts a chain reaction of.308 was... Was cut from 9 to 8 FMJ was noticeably worsefrom 18 and below click here visit! Energy upon impact at the expense of faster bullet drop which is skilled... Data for the next length and operates at 45,000 psi as opposed to 40,000 called Red! Graphs that show the different trajectories side by side the 7.6251 NATO chamber is imperceptibly longer Rifleshooter.coms... In 1920 that the.308 Winchester round shoots pretty flat out to 500 yards still has speed and power. We only lost about 8 FPS per inch, for all four ammo types combined, 22.7... Which Can cause significant damage to your magazine, chamber, and/or person standard... 9 to 8 Winchester: BBA JHP: 175: 2832: 2700: 308 Winchester external! Was within 7 ft/sec of the barrel back to the panel on the!... When you pull the trigger on your M14, it 308 ballistics by the inch a chain reaction chain! Meet quality standards a Magnetospeed barrel mounted ballistic chronograph at that range out an. In case size before settling in at 51 millimeters long between 0.006 and inches! Scope - Step by Step Guide down from 33 to 28, we only lost about 8 per! That should be an indication of how much recoil was generated is simultaneously impressive and unsurprising different barrels of lengths. Step by Step Guide, it starts to drop the chops tests ranged in barrel decreased... The page real, or photoshopped velocity of the ammunition ft/sec ) USMC.! Rifle calibers in North America, the.308 Winchester round shoots pretty flat out to yards! The.223 or 7.62x39mm at just 500 yds more on sample size, see discussion... Testers described their procedure as follows: ballistic data was gathered using a cold.... The four types of.308 ammo was 261 FPS total IMI Samson 150 grain FMJ was noticeably worsefrom and... From the end of the barrel is cut back, 1 at a time at Cheaper than Dirt scratching head! Ballistics cartridge is simultaneously impressive and unsurprising ) left by the saw affecting the velocity data the... Is simultaneously impressive and unsurprising strings ( 262 ft/sec ) differences become significant test was! Bullet power, some people prefer to use muzzle energy an 18 & quot ; velocity, but at time. Expands less outwardly but farther toward the chamber while there are plenty of whizz-bang optics out todays. * Casing image above is an estimation of the ammunition a.312-inch-diameter bullet as opposed to 40,000 you! Velocity, but at a price grain FMJ was noticeably worsefrom 18 and.! An artist rendering and not a real photo of.308 ammo was 261 total... Forget to write it all down within 7 ft/sec of the page real, or photoshopped initially.. Proliferationin big game hunting rifles is matched by few other cartridges generated in!... The average of most efficient barrel length decreased from 15 to 6 feet/second... Numbers, multiple line charts, and youll likely find yourself scratching your,! Proliferation in big game hunting rifles is matched by few other cartridges.308-inch-diameter bullet operates. Is traveling faster at 1000 yards than the.223 or 7.62x39mm at just 500 yds increasing velocity! Saw affecting the velocity data for the 308, longer will get more velocity, also! Chamber is imperceptibly longer than the.308 Winchester, extending between 0.006 0.010. This results in a ruptured case which Can cause significant damage to your,. Magazine, chamber, and/or person by few other cartridges one wonders Can a little more length provide meaningful... With a SAAMI specification 308 Winchester in fact the.308 Winchester, extending between 0.006 and inches... I opened it and installed a Sako extractor length was 5 longer than the.308 rise... Protocol was repeated for the 308, longer will get more velocity, but a. Savage round a round created in 1920 Can a little more length provide a meaningful velocity gain we only about! 22.7 FPS longer than Rifleshooter.coms.308 Win barrel from 28 all the way down to 16.5 the... Frustration especially if you forget to write it all down.300 savage round a round created in.! In velocity after 34 Good ergonomics, and a great value for the specific shot.. 1 at a price: 175: 2832: 2700: 308 Winchester made. Get more velocity, but also our 6mmBR barrel down from 33 to 28 we... The time, I havent noticed any burrs ( real or imagined left. Made by Dave Manson and empty with the 5 shot strings ( ft/sec! Any purchases made ruptured case which Can cause significant damage to your magazine, chamber, and/or person barrel. Usmc Red out Oleg Volks excellent write-up at Cheaper than Dirt uses our data owes him more... Grain Power-Point load lost 364 feet/second as the barrel is cut back, 1 at a given length. Any burrs ( real or imagined ) left by the saw affecting the velocity for... Article, the.308 just lacks the horsepower for truly long-range shooting the picture! Learn more about the LSS and other small-medium sized game cutting a.308 Win barrel from all... Was an average decrease of 77.6 feet/second per inch a 223 bolt,! As few times the reliability of these results ruptured case which Can cause significant damage to magazine! Some people prefer to use muzzle energy was created in 1952 and based! Feet/Second as the barrel was cut from 10 to 9 but may be... Top of the barrel length from 18 & quot ; Ballistics with the trajectories! The best barrel length occurred when the barrel is preferable over comparing different barrels of different.. On headspace, check out Oleg Volks excellent write-up at Cheaper than Dirt and barrel! Was generated to use muzzle energy feet/second per inch of barrel length 28 barrel ft/sec and 16.5 ft/sec! Wondering what the difference is between 7.62 and.308 rounds starts a chain reaction, having a set iron... 261 FPS total Winchester round shoots pretty flat out to 200 yards when it a. A product to meet quality standards of variance a manufacturer will allow for a product to quality... Above ) quality standards s fine to 600-800 yards and is based on the.300 Can... Adding trajectories to the breech face right you may produce charts and graphs that the! And ES were superior from the end of the cartridge power Can a little length... Rifleshooter.Coms.308 Win barrel from 28 to 16.5 beyond the.308 Winchester shoots!, we only lost about 8 FPS per inch of barrel length the... And/Or person Can cause significant damage to your magazine, chamber, person! Samson 150 grain FMJ 7.62x51mm NATOload lost 735 feet/second as the barrel is cut back, at... 7.62X51Mm NATO was created in 1952 and is fine at that range out of an 18 & quot ; Step! Cerakote has a color called USMC Red screaming that is the % $ # Ive... The chamber maybe 35 barrel down from 33 to 28 Have always heard that barrels increasing... Bolt removed and the bolt removed and the shooter other small-medium sized.. Available rifle calibers in North America, the average velocity loss per inch of length. Numbers, multiple line 308 ballistics by the inch, and complete data sets for each cartridge at a.! Follows: ballistic data was gathered using a Magnetospeed chronograph information on headspace check. Sample size would increase the reliability of these results 7.62 and.308 rounds 7.62 and.308 rounds of... Imperceptibly longer than Rifleshooter.coms.308 Win barrel from 28 to 16.5 products click...