Harold,
The Cheddite hulls are cheaply made with microscopically thin metal on the heads and plastic. I had the same problem(s) and ruined dozens and had to get a set of 16 dies for my MEC Super Sizer. Only way to reload them after firing. The metal is so thin when I shot some in 10 ga to 16 ga Gaugemate adaptors, the metal blew out so big I had to remove the adaptors and punch them out! That's how weak they are. Had same problem with hulls collapsing.
I found the 8 point crimp worked the best to help prevent the problem.
Last edited by Jerry Harlow; 05-16-2015 at 11:48 AM..
Reason: answered about metal instead of hull plastic
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