What brand dies are they? I had a junky set one time that had a screwed up size die. Also, did your seat die nut move to where perhaps the ram is hitting the shell holder when seating the bullets? I had one come loose one time on my 264 and it was "crushing" the shoulders just enough to where part of them would tightly chamber and part of them would not. Might check that out. It was invisible to the eye but obvious when I colored the brass and pushed it into the chamber.
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