I figure a picture might help. The two on the left won't chamber, the one on the right will.
I went back and pulled a round with CBC brass that wouldn't chamber, double checked the sizing die for correct sizing, set up the 4th station crimp die and then reloaded it. Same result. Then in further testing, got the same result with a piece of Tula brass I found. Interesting thing is, running over the CBC brass with a caliper at various points seems to produce the same measurements as a piece of Win brass that was good. Gotta say I am stumped. Only thing left for me to do is try those same CBC cases with a 115gr bullet and see if the issue is replicated.
Tried a CBC case with a 1.15" OAL and no dice.
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