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AR15.COM
6/6/2001 7:19:59 AM EDT
1/9 vs 1/12. What would you suggest and what really is the diff in a service rifle. Don't plan on competing or varmiting, just would like an all around combat type rifle.
6/6/2001 7:23:09 AM EDT
[#1]
I'd probably pick 1/9.. It shoots all grains pretty well.
6/6/2001 7:25:45 AM EDT
[#2]
With the 1 in 12 twist you are limited to smaller, lighter bullets (50 grn and under).  A 1 in 9 will run just about anything accurately up to 68 grns.  As 55 grn FMJ is the most common 5.56mm round available, I recommend the 1 in 9.

Bud
6/6/2001 7:34:05 AM EDT
[#3]
1 in 9
6/6/2001 8:58:31 AM EDT
[#4]
1 in 12 is the twist of the M16A1, used for 55 grain bullets. Military only went to 1 in 7 to stabilize a very long foreign tracer round.
If you only shoot 55 grain, 1 in 12 works fine, with better down range results on humans than the 1 in 7. 1 in 9 is a good general twist that allows more flexibility in ammunition.
6/7/2001 3:48:37 AM EDT
[#5]
btt