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- Dec 26, 2009
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My dad is shooting a Lyman Great Plains Rifle that has had the barrel replaced. So it's no longer a 1:66 twist its now a 1:48. He has been trying to shoot the 348 gr. hollow point Powerbelts but they seem to be tumbling. We have tried everything from 80 gr. to 110 gr. to T7 ffg. Why won't these stablize?