Will a 1 in 9 twist ar shoot 62 grain for sale?

Shanelle Koch asked a question: Will a 1 in 9 twist ar shoot 62 grain for sale?
Asked By: Shanelle Koch
Date created: Fri, Jun 11, 2021 11:32 AM

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Those who are looking for an answer to the question «Will a 1 in 9 twist ar shoot 62 grain for sale?» often ask the following questions:

🔬 Will a 1 in 9 twist ar shoot 62 grain?

"long range High Power shooters often select 1:8, 1:7.7, 1:7, or 1:6.5-twist barrels to stabilize the long 77, 80 and even 90 grain bullets used for 1,000 yard competition." AND "There is, of course, an exception: if you want to use loads utilizing the heavier, 75-77 grain match bullets currently used by Spec-Ops troops and other selected shooters, you'll want a 1:7 twist barrel.

🔬 Will a 1 in 9 twist ar shoot 62 grain ammo?

A 1/9 barrel, in MY experience, is the most accurate option when firing 55 or 62 grain ammo. Since I dont shoot the current en vogue rounds that are extra long and heavy, requiring a fast twist, I have no need for a barrel that is proven by the US Army to have a quick burn out rate.

🔬 Will a 1 in 9 twist ar shoot 62 grain ammunition?

The maker of the weapons (Colt/FN) said the 1/9 twist was optimal for the new SS109 projectile. The ARMY forced the 1/7 as a compromise so the rifle would stabalize the abortion of a tracer known as the M856, which is NOT an FN design. A 1/9 barrel, in MY experience, is the most accurate option when firing 55 or 62 grain ammo.

10 other answers

It all comes down to barrel twist, length and velocity. In a 1-9 twist barrel the 62 grains FMJ is again optimum, not the upper edge of what works. The M855 projectile is nominally .907" long so rounds of similar length will stabilize equally well even if they are of similarly low quality.

The government research determined the then-standard 62-grain bullet was most accurate when delivered from M16 test barrels with 1:9 rifling. Unfortunately, tracer rounds were longer. They added 1.7 grains to their payload and became largely unstable downrange when delivered from the same guns.

Use only 62-69 grainers in both. The 1/8 is a sub MOA all day long while the 1/9 is MOA+. Shoot PPU and Gold Medal Match 69 gr the most. Both loads are .223 Rem and the 62 gr are M855 Green tipped 5.56x45mm. The 1/8 using the GMM is a 500-700 yard shooter while the 1/9 can only reliably reach 300+ yards. Contacting Ruger for a 1/7 for the SR556.

I use 55 grain for CQB training, and use 62 grain or better for everything else – in fact,n since >70 grain is not manufacturer-recommended for 1:9 – I try to use 69 grain match bullets for ...

I believe we agree that the 62 grain bullet shoots accurately from a 1 in 9 barrel. However, the M855 cartridge was introduced at the same time as the M16A2 and the tighter twist creates more traumatic terminal performance. Have you ever seen a spinning top hit a wall and go careening off in another direction?

It’s fast, but not exceptionally so. A 1 in 8 will be perfect for shooting 62-grain rounds from a slightly shorter than average barrel. It still can stabilize those 55-grain rounds and can even step up to heavier 80-grain loads. However, most 80 grain rounds are too long to feed in an AR magazine.

Got a question for those who shoot AR-15-style rifles... What kind of barrel twist will be best for the the 62 and 77 grain ammo? Right now, my Bushmaster XM15-E2S carbine has a 1 in 9" twist, that's supposed to be good for stabilizing a wide variety of loads.

I...myself....will only shoot 55 or 62gr rounds in 1/9 twist barrels. You can go higher in grain weight but I would not recommend it. Buy a 1/7 twist barrel AR to shoot heavier rounds.

The 1-in-9 is a great compromise twist rate—not too fast to cause problems with the 55-grain bullets, but fast enough to stabilize all but the heaviest bullets under most circumstances. This twist will stabilize most traditional bullets up to 75 grains, and monolithics up to 70 grains — but they do so right at the edge of the envelope so not all rifles will do it.

Re: AR: 1:7 or 1:8 or 1:9 barrel twists The only bullets the 1 in 7 won't shoot well are the thin skinned varmint bullets. The twist rate causes some like the Speer TNT and Hornady SX bullets to come apart in flight. I own nine 223 caliber rifles ranging from 1 in 12 to 1 in 7.

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