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1/7 twist is fine for a 20" barrel, you can stabilize the heaviest bullets in .224 with it. I have heard stories about really lightweight bullets shedding the jacket at these high RPMs, but I shoot 55 grain bullets out of mine @ 3200 fps all the time without problem, mathematically this works out to well over 300,000 rpm (at the muzzle).
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NRA Lifetime Member Since 1999
"I ask, sir, what is the militia? It is the whole people except for a few public officials." George Mason
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