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All of my 2 and 3 die sets use die #1 to accomplish several things: punch out the old primer, resize the case, and expand the case mouth. Dragging the expander ball through the case mouth is a large cause of overlength cases. That is why you can buy lube for the the case mouth.
This is also why most of the people I know trim after resizing. If you are having trouble getting the pilot in the case you are either using the wrong pilot, it is the wrong size, or your expander ball is the wrong size. I had to send my .243 resize die back for that very reason.
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