Quote:
I'm at a loss to understand how sizing it again will fix it.
Are you counting on the expander button to pull the
shoulder forward again?
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It's not chambering because the shoulder is
bulged, i.e., case diameter has been pushed out at that point.
Sizing will push the case shoulder back in, the brass will go where it has freedom of movement to go -- forward,
and all's right w/ the world.