Stan the only cause I can think of is the chamber diameter of your Lifters were cut for brass shells and would be oversized versus a chamber cut for paper shells. When firing the Winchester hulls in your guns the plastic expands to the diameter of the chamber. When you crimp the reload the larger diameter is very tight in the die and the crushing occurs before the cycle is complete. If it happens with a new hull then I would suspect the crimp die. Craig
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