What grain bullet is best for a 1 in 7 twist?

What grain bullet is best for a 1 in 7 twist?

If you are shooting long range, or want more penetration, you want a heavier bullet in the AR, such as a 62- or (preferably) a 77-grain. While 62-grain bullets prefer a rate of twist around 1:8, 77-grain bullets weights favor a 1:7 twist rate.

What is a 1/7 twist barrel good for?

The first M16’s had 20+ inch barrels. Shorter barrels and longer bullets was the reason for faster twist rates. Very good read, I take it from the graph at the top a 1-8 is more or less the “Jack of all” seeing it will work well with most ammo.

Is a 1/7 twist rate good?

Standard rifles used by the United States military, typically have a twist rate of 1:7. This is a pretty aggressive rate, but it works well to stabilize the heavier projectiles used in modern combat zones. Most modern civilian sporting rifles will never see combat.

What 5.56 ammo is best for a 1 7 twist?

Lastly, the 1:7 twist barrel is the “mil-spec” choice, as the U.S. military adopted this setup in the 1980s for its M16A2 rifle running a 62-grain M855 5.56 round.

What grain 556 does military use?

The United States adopted it as the M855, painting the tip green to allow soldiers to easily differentiate it from older M193 ammunition. The M855 uses a sixty-two grain projectile stabilized by a 1:7 twist barrel.

What’s the difference between 1/7 twist and 1 9 twist?

The 1:9 barrel is best for stabilizing lighter and mid-weight bullets between 45 and 77 grains. The 1:7 barrel, found in the M4, M16A4, Mk12 SPR and HK416, can stabilize up to a 90-grain bullet, and handles 70- to 77-grain projectiles across a wide spectrum of velocities.

Can a 1/7 Twist shoot 55gr?

The quicker 1 in 7 twist might shoot the 55 grain loadings such as the M193 very well or even shoot lighter weight bullets than that.

What ammo do Navy Seals use?

The M855A1, a 5.56 mm Ball ammunition, is an enhanced performance round for today’s combat and training environments. It works with the M4 Carbine, the M249 machine gun, and the H&K and M16A2 rifles. It is suitable for use in most weapons with a 1-in-7 barrel twist.