WallyL, give them a try in your new barrel. It may or may not work well, but, until you try it you'll never know
I have 5 .243 win barrels, and all are 1 in 10. I get great results with 95 gr bullets, and decent groups with 100 gr Hornady BTSP. I have not tried your weight, since my rifles are just for hunting and shorter range target work.
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