Saw on Discovery channel last night the Military is changing from a 24" to a 20" barrel on the M40 Remington 308 sniper rifles. They are also changing to a 1-10 twist.
Military going to 20" M40 barrels
- Thread starter startrek
- Start date
Re: Military going to 20" M40 barrels
I could see an "in addition to" the current rifle for urban sniping, but why would they eliminate the 24" barrel unless there is a longer range caliber implementation (300 Win or 338 Lapua) on the way?
I could see an "in addition to" the current rifle for urban sniping, but why would they eliminate the 24" barrel unless there is a longer range caliber implementation (300 Win or 338 Lapua) on the way?
Re: Military going to 20" M40 barrels
Man, I must be shooting at the wrong range. I know there are plenty of guys here using 20" or less, but everyone that I have been around while shooting 1K likes 24". I wasn't going to try my 18.5" M14 at 1000 with anything other than 155 Scenars, but it appears that 175 MK's might work as well.
Man, I must be shooting at the wrong range. I know there are plenty of guys here using 20" or less, but everyone that I have been around while shooting 1K likes 24". I wasn't going to try my 18.5" M14 at 1000 with anything other than 155 Scenars, but it appears that 175 MK's might work as well.
Re: Military going to 20" M40 barrels
I cut my F-class to 20 inches last year (from 26) and can see no difference in accuracy . Muzzle velocity is a bit less and I have had to work up the new dope. I also threaded it for my silencer (it is really 20.6 inches and threaded, the shoulder is 20 inches, don't ask me why my gunsmith did it that way)
I cut my F-class to 20 inches last year (from 26) and can see no difference in accuracy . Muzzle velocity is a bit less and I have had to work up the new dope. I also threaded it for my silencer (it is really 20.6 inches and threaded, the shoulder is 20 inches, don't ask me why my gunsmith did it that way)
Re: Military going to 20" M40 barrels
I believe all other variables being equal a short barrel will outshoot a longer barrel, velocity is the only concern but with the new powders velocity is not near the problem it once was. A shorter barrel will be stiffer with less harmonics and vibration.
I believe all other variables being equal a short barrel will outshoot a longer barrel, velocity is the only concern but with the new powders velocity is not near the problem it once was. A shorter barrel will be stiffer with less harmonics and vibration.
Re: Military going to 20" M40 barrels
1/10 twist makes good sense.
In the 308, bullet choice trumps 4" of barrel, and the right twist will open the doors for the optimum LR bullets.
1/10 twist makes good sense.
In the 308, bullet choice trumps 4" of barrel, and the right twist will open the doors for the optimum LR bullets.
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