Harold, paper shells are crimped with a smooth pre-crimp die. For 12ga I have the old steel pre-crimp die for some of my Mecs.. They also sell a smooth plastic pre-crimp die for the 12ga. I've taken about five of the plastic six point starter crimps and ground the ribs out of them making em smooth. That way it doesn't matter if it's a paper shell or a plastic one with either six or eight style crimp. If you have a Mec machine with plastic dies, you could do the same for any gauge.
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Paul Harm
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