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Old 01-15-2011, 08:25 PM   #1
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Default Rifle Twist

I am about to buy a barrel for my AR build and I just want to figure out what twist i want. I've found barrels in 1:7 and 1:9 but im just not sure which one i want. I don't know what ammo ill be shooting but ill use whatever is at the local gun store that will work with the barrel twist i have (bullet weight). im going to use this AR to shoot targets and to shoot woodchucks, fox, coyotes, etc. i dont expect to be shooting over 200 yards but it'd be nice to have a barrel that i could shoot that far with. i plan on getting a scope for the AR and some iron sights. could anyone shed some light on this issue? thank you!

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Old 01-16-2011, 12:08 AM   #2
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1:7 so you can shoot the heavy stuff plus its the most readily available.

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Old 01-16-2011, 02:15 PM   #3
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alright thats what i was thinking also. thanks for the advice.

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Old 01-16-2011, 02:19 PM   #4
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Not a problem.

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Old 01-17-2011, 08:53 PM   #5
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Q: why would somone want 1:9 twist?

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Old 01-17-2011, 09:00 PM   #6
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Quote:
Originally Posted by Gloves View Post
Q: why would somone want 1:9 twist?
For shooting lighter bullets like 55 grains for shooting varmints.
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Old 01-19-2011, 09:19 PM   #7
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1 in 7" twist is military standard
they shoot 55 or 62grain?

1 in 8" is better for heaver grain (62)?

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Old 01-19-2011, 09:28 PM   #8
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My rifle has a 1:8 twist Wilson Combat barrel on it, and I cannot shoot anything lighter than a 69gr. bullet. It won't group worth a darnn. As for a 1:7 twist barrel, I would think that you would want an even heavier bullet. I know that alot of the guys shooting the AR for really long ranges, pushing the distance limit of the .223 round, they are using 75gr. and 80gr. bullets in 1:7 twist barrels.

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Old 01-19-2011, 09:58 PM   #9
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Its really the length of the bullet that determines what twist you need.
Military 62gr ss109 bullets are very long for their weight due to the steel penetrator. IIRC they are actually about the length of a 69gr BTHP.

I use a 9 twist in a couple 223's and they shoot well with the 50 -69grain bullets I use for competition and varmint hunting.

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Old 01-19-2011, 11:14 PM   #10
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Ive only used 1:7 to date and mostly shoot 55gr-62gr ammunition. So far so good. However, I usually practice at more practical ranges. 25-100 yards. I would be interested in seeing how a 1:8 twist barrel handled the gamut of available ammunition.

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