I took two nylon blocks, tipped them 45 degrees and used a end mill to mill a " vee " in each one. They're used in a cheap drill press vice. Any size shell will work.
I have both the BPI and PRing roll crimpers in 12 and 10ga and prefer the PRing one with 4 pins. It works just fine and I don't slow down the drill press. JMHO, but I think they work better when warm, and the higher speed helps warm em quicker.
Funny, I never thought of using my Sizemaster. Da.
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Paul Harm
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