I've found too much crimp produces rounds that tumble/keyhole. It doesn't take much to over do it either. What I do now is to use a kinetic bullet puller on the first test round or two. If I see a distinctive crimp ring in the pulled bullet, I back off the die till I don't.
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Dave
Last edited by Wee Hooker; 01-07-2017 at 12:40 PM.
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