For me, the three die set works fine. for 9mm. I don't feel that I need special crimp die when all I'm doing is taking the flare off. If you want to use the crimp die, use the crimp die. It will prevent having to seat bullets and crimp in the same operation, but I don't have any trouble with that with taper crimps. Now, roll crimps are a different story. I don't try to seat and crimp in one operation.

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