hey gundigest,

Were you trying to crimp your cases onto the bullets? I don't like crimping non straight walled cases, so i keep the seating die backed off the shell holder quite a bit. Then ajust the SEATER plug to get the bullet depth you want. "If" you ajust the seat die too far down, it will crimp, and "over crimp" a longer case, causeing what you described.

Bottom line is, each set of dies "should be" ajusted for the rifle they will be used with, especially the full sizer die!!

Drilling Man