After dropping the shot you could try adding a standard overshot card before you crimp. This will flatten the final crimp to the shell perfect. For 12 gauge, use 16. For 10, use a 12, etc....
I was getting dished crimps like the picture Pete posted when I needed to switch to 700X which is a more dense powder than Clays since I ran out. The overshot card made a nice tight flat crimp and you get confetti for special effects when you fire off the gun....
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