The size of the resized shell is limited by the "bottomed out" collet fingers. Also, dirt, powder, or shot will keep the collet fingers from coming together. You have to keep it real clean. I load on a Ponsness-Warren and have for about 45 years. There is nothing to clean, and a shell that goes into the P-W sizer comes out only one size. I have used MECs from time to time and have had occasional problems with certain guns that would not take those collet sized shells, mostly .410s.
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