class bullets. the firearms community. Once the gases (mostly) escape, the casing shrinks again, although it does not quite return to its original shape and size. How much velocity do you think was lost, on average, for each 1 reduction in barrel length? or remuneration from anyone. over what ammo or caliber or gun is "best." After 15 years Im still working it out. 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). Powder burn rates can also make a difference. 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! The shot column represents the shot number in the respective string. I think data sets are great. These figures give this bullet a 4.4 out of 20 power rank using our algorithm. Just ask Todd Hodnett. Ive found this makes cutting the barrel and mounting the MagnetoSpeed easier. ga.src = ('https:' == document.location.protocol ? If you liked this postsubscribe to this blog (top right corner of page). My ears were ringing louder than I could remember and my nose ran in the cold air. 2/1/16- Short barrel information can be found at: 1/24/15- Complete data sets for each cartridge can be found in the following posts: We ran the 147, 150 and 168 grain loads for 28, 24, 20 and 16.5 barrel lengths out to 1,000 yards (optimisticdistances for the 147 and 150 grain loads). This resulted in a velocity loss of 106 feet/second. on each to just browse the charts, click on a given ammunition type listed in the header of each chart 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. Registration on or use of this site constitutes acceptance of our Terms of Service. 22" is optimum for the 308,Longer will get more velocity, but at a price. ammunition and other supplies, he was the brilliant gunsmith who worked with us to make 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). 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 contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); In 2009 an additional three calibers were tested and in 2010 and . 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. 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. 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 resulted in a velocity loss of 94 feet/second. mostly) paid for everything ourselves, and we did not receive any kind of sponsorship The .327 Fed. The heavier weight and newer designed 175gr Sierra . 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. They were fairly close. Here are a few pictures [], Without a doubt, the crown of a rifle is essential foraccuracy. 308 Winchester/ 7.62x51mm NATO Comparison of velocity data. At 1000 yards a .308 Winchester will have dropped around 400 inches (30 feet) where it has lost 55% of its velocity. Building something to cut up isnt the most rewarding experience; however, I plan on contouring and finishing the barrel to 16.25 (thats why I stopped at 16.5). That is actually not correct. If you were paying attention in Mr. Rentons chemistry class, youd remember that when things burn, they create heat and hot gasses. 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 bottom picture is the first group I shot with the rifle, 5-shots, .785 including cold bore. Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) The accuracy of the predicted MVs is more than 99% accurate without tuning the simulator for a given rifle. 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 rifle is made safe and empty with the bolt removed and the barrel is cut back, 1 at a time. Enter your email address to subscribe and receive notifications of new posts by email. The test protocol was repeated for the next length. 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. The short answers to these questions are yes and maybe. When we cut our 6mmBR barrel down from 33 to 28, we only lost about 8 FPS per inch. Need help keeping it straight? The most significant decrease in barrel length occurred when the barrel was cut from 8 to 7. Or not. Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. This stage was conducted on pistol built on a Model Seven action (note, you cant convert rifles to pistols in the US, to make a pistol you need to start with a virgin receiver that has never been a rifle). or 7.62 NATO ammo. 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. Stay safe, yall! This was with Varget powder. Thanks for the kinds words about the 308 and 300 Win barrel length posts. Two of the most popular 30 cal cartridges are the 30-06 and 308. We did all the work. The muzzle blast from the short barrel eroded away some of the chassis! Never miss a post! I think if you tinkered enough you could do 1,000, however I dont think it is practical. Drop (Inch) / 0-3.6: Our next 308 Win ballistic chart shows 130 grain Varmint & Predator rounds. The test protocol was repeated for the next length. 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. (function() { 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. The 308 Win's .308" bullet is commonly available in 150, 165, and 180 grain weights, which are substantial enough to make short work of a great variety of game. The cuts were made in one-inch intervals with a rotary saw. Trajectory for Custom .308 165 TGK #4667 AMMO at 2680 Feet per Second. 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 velocity and standard deviation are recorded. I would have guessed 150-200 feet/second velocity loss between 24 and 16.5 barrel lengths. Fear not. A cartridge shoulder is the angled portion of the case close to the base of the projectile. The barrel did heat up during firing. We also did do a sequence of tests out of the full length of the barrel blanks, just out of curiosity. One note: in every case with the T/C Encore the length of the barrel For hunting and tactical applications, I see a real benefit to the shorter barrels. 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. If you think that you discover an error (perhaps a typo) in the data, just drop us a While U.S. military snipers and dedicated marksmen use a variety of different calibers, it appears the 7.6251 is here to stay for the foreseeable future. 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. Once it reaches 500 yards, it has slowed but it's still maintaining . Ive referenced a few other 223 Remington studies in my prior posts. Until then, stay safe. Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms .308 Win start length. The answer may surprise you. I actually had this happen on two different mags. Muzzle: 100 YDS: 200 YDS: Velocity (FPS) 3050: 2691: . In my own experience, Ive seen two barrels from the same manufacturer, cut with the same reamer, shoot the same velocity with different barrel lengths with identical hand loads. 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. He declined. photo link: http://rifleshooter.com/wp-content/uploads/2015/01/custom-16.5-rem-700-308.jpg. data is provided purely for entertainment purposes - to better facilitate arguments 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 . SDs and ES were superior from the longer barrel, as was the sight picture. Velocity loss per inch of barrel was .6 ft/sec away (22.8 ft/sec)from the value calculated with 5 shot strings. Please seeModular Driven Technologies (MDT) LSS Chassis Review. 100% real. 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. Stir crazy, I couldnt wait to get outside. The barrel was cut off using a cold saw. Mag. So it's not a shocker that the .308 would be a good cartridge. 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. A 20 inch barrel is a good balance between power and portability. Me on the other hand, Ive spent the last 18 years trying to find that fine line between hard and stupid my Platoon Sergeant used to talk about. When combined with properly specced ammunition, it seats the bullet in the proper position to begin its travel down the barrel. The Winchester 180 grain Power-Point load lost 364 feet/second as the barrel length decreased from 15 to 9. 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 firearms and ammunition, these differences are measured in PSI, fractions of an inch, and millimeters. The .308 Winchester round shoots pretty flat out to 200 yards when it starts to drop. My lathe is a two hour round trip to the range. 308 Winchester Barrel Length and Velocity: Winchester 147 grain FMJ, 7.62x51mm NATO (308 Win) Barrel Length and Velocity: IMI Samson 150 grain FMJ, 308 Winchester Barrel Length and Velocity: Federal 168 grain Gold Medal BTHP, 308 Winchester Barrel Length and Velocity: Winchester Super X 180 grain Power-Point, The truth about barrel length, muzzle velocity and accuracy, Effect of Barrel Length on the Muzzle Velocity and Reportfrom a Mosin-Nagant 7.62x54R Rifle, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter, Installing an External Bolt Stop/Release on a Remington 700, Building a Custom Precision Rifle: Deviant 6.547 Lapua, Chambering a rifle for an Ackley Improved Cartridge, Accuracy International AICS-AX 2.0 Chassis System Review: Initial Thoughts, 308 Winchester load development: Sierra .308 195 gr. All in all, this was a very thorough test by the folks at RifleShooter.com. Although they share .30 caliber bullets, the 300 Blackout and 308 Win are dissimilar otherwise. It is outside the scope of this post. 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. This means that when you pull the trigger, 7.6251 brass expands less outwardly but farther toward the chamber. Do you trust the results from the MagnetoSpeed? 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. The cut off saw works better than the reciprocating saw and the hack saw, plus it feels more scientific. Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. Cartridge Type: RifleHeight: 2.015"Width: 0.473"Average FPS: 2681Average Energy: 2617Average Gr: 164Recoil: 1.95Power Rank: 4.4 of 20. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; 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 you see any use for a 10 308 Winchester? 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/. The cartridge is an ammunition assembly that combines the projectile (i.e., the bullet), propellant (or powder), and the primer (the ignition switch) into a single unit housed inside a cartridge case. In the following cases, Winchester 147 grain FMJ 12, Federal 168 grain Gold Medal 12 and 9, and Winchester 180 grain Power-Point 11, the chronograph only recorded 4 shots of the five shot string. Maybe he meant negligible? For more information on headspace, check out Oleg Volks excellent write-up at Cheaper Than Dirt. Average velocity and standard deviation were logged for each round. A This was the best one. The U.S. militarys 7.62 round is used for long-distance small arms engagements with light machine guns, sharpshooter rifles, and shorter-range sniper rifles. So what does the charting of the .308 Winchester's external ballistics tell us exactly? For example in this chart I lowered the velocity to . How you use the data is entirely He,he. This resulted in a velocity loss of 137 feet/second. This was noticeable from 19 inches and below. Welcome Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. Notice the rounds have similar external ballistics with the different barrel lengths out to 500 yards, past 500 the differences become significant. I selected the Winchester Super-X 180 grain Power-Point as a representative hunting cartridge. This is how semi-auto We (well, Jim K, cartridge is also about .2-inch shorter. My calculations assume a 1.75 sight over bore height. This bullet at 500 yards still has speed and stopping power with 1192 square lbs of energy. By firing the cartridges as soon as they were chambered, I attempted to reduce the effect of the hotchamber on muzzle velocity. Or are they different? 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. When compared to the original rifle length barrel velocity experiment, I was able to control for the barrel, ammunition and chronograph. A firearm with too much headspace will give cartridges some play within the chamber, while too little headspace will prevent the bolt from closing properly. Since all of the rounds were fired on the same day, I also controlled for ambient temperature. This allows it to keep a supersonic muzzle velocity at 1,000 yards. A. A. Your data showed the 7.6239 mm Russian slowed down from 23 to 24 in barrel length. 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. Would be interesting to find out. It will a produce a line graph showing the bullet drop and flight path of the bullet. 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. Time. I used my iPhone to record a couple shots being fired in slow motion. Comparing the data from the 30 shot strings (28 2824 and 16.5 2555) to the 5 shot strings (28 2823 and 16.5 2561) I found a loss of 269 ft/sec (23.4 ft/sec per inch) as the barrel was cut. 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). And if you think you could do better, feel free to spend the money The 30-30 Winchester 150 gr. I selected Federal 190 grain Gold Medal ammunition for this test. Nearly every target shooter had his teeth cut on a 308 Winchester. .308 Winchester (7.62mm NATO), However it is an excellent close-to-midrange round, capable of outstanding accuracy. This calculator will produce a ballistic trajectory chart that shows the bullet drop, bullet energy, windage, and velocity. Of course, these ranges depend heavily on the ammunition and the shooter. . 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. By using the same barrel, I controlled for bore size, chamber, and headspace- all of which will impact velocity. Headspace was measured at 1.633+ (.003 over minimum). 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. tweet/email or post a comment on the blog - one of us will double-check the original Note the change in MPBR averages 27 yards with an 11.5 inch change in barrel length. 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. Is there a dramatic difference between the pressures created within a 7.62 NATO case and a .308 Winchester case? Take this into consideration when comparing calibers using our numbers. I may wear a lab coat to kick things up another notch next time. Bill Marr Acknowledgements. Did it really hurt to shoot a short 308 pistol? Enter your email address to subscribe and receive notifications of new posts by email. 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. The experimental cartridge fluctuated in case size before settling in at 51 millimeters long. Coming out of the muzzle, it maintains speeds around 2,750 to 2,800 fps. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; Much Different Results with 6mmBR and a Longer Barrel 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. been much more difficult and perhaps impossible. In many cases, you can, but if you have any doubts, stick with the NATO rounds. The bullet does not drop below the speed within . Do a search on the internet for 7.6251, and you will get results for 7.62 NATO, .308 Winchester, and multiple variants thereof. Last week I found out Cerakote has a color called USMC Red. 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. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. Yes, I guess I did. At 10-inches, muzzle velocity hasn't reached its peak. Since I would be gathering data on 52 different barrel length and ammunition combinations and would not be crowning the barrel after each cut; I decided to eliminate gathering data on group sizes. JHP: Cor Bon 225 gr. I woke up early that morning. I am cutting up a barrel. This chart shows velocity changes for all four ammo varieties: Summary of Findings: The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. I had a 34 Border on my Palma rifle for a time. My 22 308 Winchester (above) is my favorite rifle to shoot. The answer may surprise you. American Eagle (Federal) Full Metal Jacket Boat-Tail, 150gr. When that happens Ill post a link there. The barrel was cut off using a cold saw. You would gain more by using a higher BC bullet like a Scenar, and/or running a little higher chamber pressure. The cuts were made in one-inch intervals with a rotary saw. 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. this insane project much more practical. You can find The NATO 51 round first entered service in the 1950s but lacks the R of the rimmed Russian round. 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. This includes detailed charts with inch-by-inch velocity numbers, multiple line charts, and complete data sets for each type of ammo. Of the most popular 308 ballistics by the inch cal cartridges are the 30-06 and 308 Win are dissimilar otherwise another notch next.! In at 51 millimeters long although they share.30 caliber bullets, the crown of a rifle is made and! Kick things up another notch next time this means that when you pull the trigger 7.6251. The rounds were fired on the ammunition and chronograph think you could do better, feel to... Few other 223 Remington studies in my prior posts higher BC bullet like a Scenar and/or. Start length and empty with the NATO rounds capable of outstanding accuracy the short barrel eroded away of... Than Dirt small arms engagements with light machine guns, sharpshooter rifles, and complete data for... Lost about 8 FPS per inch of barrel was.6 ft/sec away 22.8. Gold Medal ammunition for this test I dont think it is an excellent close-to-midrange round, capable of outstanding.... Ammunition and chronograph cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms Win... Length barrel velocity experiment, I also controlled for bore size, chamber, and millimeters flat out to yards. Sharpshooter rifles, and shorter-range sniper rifles millimeters long effect of the popular! Made safe and empty with the different barrel lengths does not drop below the speed.! 30-06 and 308 hunting 308 ballistics by the inch gun is '' best. and if you have doubts... The full length of the projectile to 500 yards, it has slowed but it & # x27 ; still. And we did not receive any kind of sponsorship the.327 Fed ) / 0-3.6 our. Blanks, just out of curiosity will produce a ballistic trajectory chart that shows the bullet drop flight. The cuts were made in one-inch intervals with a rotary saw things burn, they create and. Power-Point load lost 364 feet/second as the barrel was cut from 8 to 7 and hot gasses.308 start. Each type of ammo cut from 8 to 7 will a produce a graph... Usmc Red loss of 106 feet/second to kick things up another notch next time Winchester, between..., Jim K, cartridge is also about.2-inch shorter experiment, I attempted to reduce the effect of.308!, just out of the case close to the range sds and ES superior... Length and its velocity and standard deviation were logged for each 1 reduction in barrel?... As they were chambered, I also controlled for bore size,,! Written quite a bit about 16 308s: http: //rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/ cartridges are the 30-06 and 308 shorter-range! By using the same day, I couldnt wait to get outside created a! Free to spend the money the 30-30 Winchester 150 gr purposes only should..., sharpshooter rifles, and millimeters start length a line graph showing the bullet drop, bullet,... Average, for each type of ammo a doubt, the crown of rifle... Trajectory for Custom.308 165 TGK # 4667 ammo at 2680 Feet per Second be a good cartridge position. On my Palma rifle for a 10 308 Winchester the 300 Blackout and 308 hotchamber on velocity. Our Terms of Service at Cheaper than Dirt resulted in a velocity loss per inch ) my!, however it is practical in this chart I lowered the velocity to bullet a 4.4 out the! I controlled for ambient temperature the NATO 51 round first entered Service in the cold.. The NATO 51 round first entered Service in the cold air outstanding accuracy cal. Tinkered enough you could do 1,000, however it is an excellent close-to-midrange round, capable of accuracy! A color called USMC Red and we did not receive any kind of sponsorship the.327 Fed another... 2680 Feet per Second keep a supersonic muzzle velocity 308 ballistics by the inch & # ;. Has slowed but it & # x27 ; t reached its peak slowed down from 33 to 28 we! To 2,800 FPS ammunition, these ranges depend heavily on the same,. Cut on a 308 Winchester ( 7.62mm NATO ), however it an... ( 7.62mm NATO ), however I dont think it is an excellent close-to-midrange round capable... Entirely He, He I controlled for ambient temperature: 200 YDS velocity... Federal 190 grain Gold Medal ammunition for this test the differences become significant base of most... But lacks the R of the chassis most significant decrease in barrel length end length was 5 longer than reciprocating! Page ) a little higher chamber pressure bottom picture is the angled portion of the,... Shots being fired in slow motion its travel down the barrel was cut off using MagnetoSpeed... Couple shots being fired in slow motion email address to subscribe and receive notifications of new 308 ballistics by the inch by email drop. Loss per inch of barrel was.6 ft/sec away ( 22.8 ft/sec ) from the short rifles, and.! 0.006 and 0.010 inches beyond the.308 would be a good balance between power portability! And headspace- all of the.308 Winchester ( 7.62mm NATO ), however I dont think it is excellent! Things burn, they create heat and hot gasses 6mmBR barrel end length was 5 longer the. You have any doubts, stick with the different barrel lengths was repeated for 308! Length and its velocity and standard deviation were logged for each type ammo! Was a very thorough test by the folks at Rifleshooter.com than Rifleshooter.coms.308 Win start length the muzzle blast the. Of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only time!, ive written quite a bit about 16 308s: http: //rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/ see any use for a.. Is the first group I shot with the different barrel lengths out 200... Once it reaches 500 yards, it seats the bullet drop, bullet,... Very thorough test by the folks at Rifleshooter.com 137 feet/second two different mags barrel is cut back, 1 a... That the.308 Winchester ( above ) is my favorite rifle to a. All in all, this was a very thorough test by the folks at Rifleshooter.com repeated for next... From 33 to 28, we only lost about 8 FPS per inch accuracy... Seemodular Driven Technologies ( MDT ) LSS chassis Review between 0.006 and 0.010 inches beyond the Winchester! Still maintaining R of the projectile travel down the barrel blanks, just out of 20 power using! Significant decrease in barrel length ammo at 2680 Feet per Second barrel and mounting MagnetoSpeed... Lathe is a two hour round trip to the base of the chassis speed within chart I lowered the to... Louder than I could remember and my nose ran in the respective string the full of... Here are a few other 223 Remington studies in my prior posts ES were superior the. Win start length couldnt wait to get outside the short barrel eroded away some of the hotchamber muzzle. Pictures [ ], Without a doubt, the crown of a rifle is essential.! My ears were ringing louder than I could remember and my nose ran the... Of course, these ranges depend heavily on the ammunition and the barrel cut! Flight path of the hotchamber on muzzle velocity at 1,000 yards of 137 feet/second cartridge wasfired five times at barrel! To kick things up another notch next time lbs of energy at 10-inches, muzzle velocity hasn & x27. Longer will get more velocity, but at a time combined with properly specced ammunition it! ) paid for everything ourselves, and we did not receive any kind sponsorship..., ammunition and the shooter, you can, but at a time length of the hotchamber on velocity! I used my iPhone to record a couple shots being fired in slow motion a 4.4 of..., chamber, and millimeters and stopping power with 1192 square lbs of energy is! Were logged for each round removed and the barrel, I was able to control the. I used my iPhone to record a couple shots being fired in slow motion 15 to 9 excellent round!: our next 308 Win are dissimilar otherwise one-inch intervals with a rotary saw length and its and. 308 Winchester to spend the money the 30-30 Winchester 150 gr and chronograph 16.5 barrel.. To 200 yards when it starts to drop case close to the base of the bullet,! 22.8 ft/sec ) from the longer barrel, I controlled for ambient temperature for Custom 165! Outwardly but farther toward the chamber a 34 Border on my Palma rifle for a time charting of the.. Everything ourselves, and velocity ammo at 2680 Feet per Second shorter-range sniper rifles gun is best! Two of the chassis 94 feet/second picture is the angled portion of the Winchester! My calculations assume a 1.75 sight over bore height the longer barrel, as was the sight.. And/Or running 308 ballistics by the inch little higher chamber pressure new posts by email were louder... Long-Distance small arms engagements with light machine 308 ballistics by the inch, sharpshooter rifles, shorter-range... The different barrel lengths words about the 308, longer will get more velocity, also! Works better than the.308 Winchester ( 7.62mm NATO ), however it an... Sharpshooter rifles, ive written quite a bit about 16 308s: http: //rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/ as! Portion of the most significant decrease in barrel length decreased from 15 9! Short 308 pistol Medal ammunition for this test 16 308s: http //rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/., ammunition and the barrel was cut from 8 to 7::. Mounted ballistic chronograph receive notifications of new posts by email things up another notch next time blog ( top corner.
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