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1/8 should be good for just about everything short of tracers. The Army Marksmanship Unit picked 1/8 barrels for the M-16 SDM rifles for a reason.
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For the love of God, get the terminology right or don't post.
I have a 24" SS RRA Varmint, it has a 1 in 8 twist and I love it. It is my most accurate AR, and I have shot up to 77gr OTM in it. It shot them great. All of my shorter rifles have a 1 in 7 twist, but I cannot complain about the RRA Varmint.
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