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Twist Rate for Barrel?
What is the right twist rate for an AR15/M16 barrel? The below is from
Corey Sattler of Olympic Arms. It will give you a good idea of what you
should look at.
- 1x7
Technically too tight of a twist for any .224 bullet widely
available, including the 80 grain. Manufactured originally to stabilize
SS109 and/or tracer ammo, but further military testing has shown other
twists to be superior. Some of the very heavy custom stuff (87 grain?) may
work well, but why?
- 1x8
Great twist for 69-80 grain bullets. Sierra once informed me that
the perfect twist for their 80gr was 1x8.2xxxxx (blah blah blah big long
engineers explanation followed).
- 1x9
Good all around twist ratio. Best suited for 52-69 grain, but either
end of the envelope will be questionable.
- 1x10
Practically the same as 1x9, but favors the lighter side a little
more.
- 1x12
Great for the 40-52 grain bullets. Most often found on bolt
action rifles as their primary use is varminting. All right for the 55 grain,
but not the best.
- 1x14
If you want to under stabilize the .224 bullet, use this twist.
Useless except for tumbling effect it causes upon bullet impact. IMHO,
better to shoot straight with a good HP bullet as your chances to hit are
better and damage will most likely be greater also.
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