Did anyone mention the danger of bullet set-back and the fact that the OP might be swaging the bullet down in diameter? Quite likely the expander if too small or the OP is simply belling the case mouth and NOT expanding.
My COL is 1.23-1.247".
Do not shoot any rounds that have any bullet-setback with thumb pressure.
Stovepipe? the fired case or the loaded round? Did you make up a couple of inert "dummy" rounds to establish your COL or just used some vision of what it should be?
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