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

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

While 62-grain bullets prefer a rate of twist around 1:8, 77-grain bullets weights favor a 1:7 twist rate. With AR-15 ammo, it is likely going to be the most common bullet weight, which is 55-grain (a 1:9 twist rate).

Can you use 55gr 1 7 twist?

Not at all. Our military has used Colts (1 in 7) twist with 55 gr. ammo since about 1963. Another great thing about the 1 in 7 twist rate is that those barrels will shoot any ammo you put through them– from 55 gr. to 75 gr.

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.

Is a 1/7 twist good for an AR-15?

Give 1:7 a try. Both are extremely common, and I have little doubt you’ll find what you need for most uses. As a general rule, you can get away with a faster spin rate than necessary for a specific bullet, but twist a bullet too slowly and you’ll lose some of your accuracy and stability.

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 twist rate for 5.56 is best?

The 1:9, 1:8 and 1:7 are popular twist rates that will stabilize most . 223/5.56 ammunition.

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.

What is green tip ammo?

Whether you recently purchased your first AR platform rifle or have been shooting for quite some time, chances are you have probably heard the phrase “green tip ammo.” This popular 5.56 cartridge is also sometimes referred to as a “penetrator round” due to its 62-grain projectile, partially steel core, and enhanced …

Is green tip 5.56 armor piercing?

Green-tip ammunition is most common in 5.56/. These rounds were originally considered controversial, as they meet one of the criteria of the federal definition of armor-piercing ammunition. However, the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) has exempted 5.56/.

What 556 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.

How many grains is a 5.56 round?

62 gr.
The 5.56×45mm NATO SS109/M855 cartridge (NATO: SS109; U.S.: M855) with standard 62 gr. lead core bullets with steel penetrator will penetrate about 38 to 51 cm (15 to 20 in) into soft tissue in ideal circumstances.

Do 1/7 twist barrels shoot 77gr ammo well?

Your assumptions about the 1:7 twist barrels ONLY shooting 77gr ammo well and everything else “crappy” are completely unfounded from my experience. Same is true with 1:9 twist barrels shooting “pretty much anything pretty good.” Most 1:9 twist barrels I have used won’t shoot 69gr and heavier bullets as well as a tighter twist barrel.

How much ammo can a 1 7 twist rifle handle?

If you want a mil-spec rifle, the 1:7 barrel runs 223 ammo loaded with a 62 grain projectile like a dream. This rate of twist can also handle even heavier bullets (up to a hefty 90 grains). However, if you want to run lighter 55-grain ammo through such an aggressive twist, you’re going to notice a deterioration in accuracy.

What does 1 7 twist mean on a bullet?

The first figure indicates one full rotation of the bullet, followed by the number of barrel-travel inches (in the United States, anyway) required for its completion. A 1:7 twist means the bullet turns a full 360 degrees every seven inches of barrel.

Can a 1-9 twist barrel shoot anything?

A 1:9 twist shoots pretty much anything pretty good. I am serious – has anyone else seen this happen? Your assumptions about the 1:7 twist barrels ONLY shooting 77gr ammo well and everything else “crappy” are completely unfounded from my experience. Same is true with 1:9 twist barrels shooting “pretty much anything pretty good.”