I have had three guns with 308 sized cases and 15" and 16" barrels, 2x 308 and 1x7mm-08 and they all shot well under 3/4 MOA with plenty of juice to take out any large game at 300 yards and beyond. Two of them were pistols. I never felt the need for a brake even on the pistols, but they do make your follow up shots faster.
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