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Originally Posted by JohnKSa
1:9 is fast enough to stabilize anything that is short enough to fit in an AR magazine. With a barrel under 20" and beyond 500yds you could run into trouble stabilizing bullets 75gr or heavier. Other than that, there's no need to go faster than 1:9.
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While that may be true down south, it doesn't work that way up here when it gets cold. 1:9 works fine in the summer, but when the temp gets close to zero, 1:9 from a 26" Savage 12FV will keyhole a 75gr HPBT at 50 yards, while 69gr is still accurate. My 1:8 twist AR still stabilizes both of them in the cold.