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I'd rather trim my revolver cases and be done it, I've had case lenghts vary .008 in a 50rnd box of cartridges, not to mention case lenght variations between different manufacturers. When useing a heavy roll crimp on magnum loads I don't want to have the trouble of under crimp, and over crimping to the point the case is deformed and won't chamber in the cylinder.
Case trimming solves the problem .
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