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Old January 14, 2021, 01:43 AM   #9
Senior Member
Join Date: December 5, 2019
Posts: 769
I've slugged my barrel and the groove to groove measurement is .31105" and the Barnes is advertised as .311. The initial test load tests was not as good as those shot with the .312" Hornady. Speer .311 bullets did not perform as well either. Any other suggestions?
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