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My rule of thumb is... don't do it unless there is a specific reason to do otherwise. All my rifles are bolt action and there is no reason at all to crimp any of them. I hear some of the guys say that it's good to put a small taper crimp on them for semi auto rifles but I don't know anything about those. As long as my brass mouths are about 0.003" smaller than the bullet before I seat them, that is plenty of tension to keep the bullet in place.
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