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I am using new brass, but ran them through the resize die anyway.
From the users manual that came with the case gauge, it looks like the gauge only touches the middle part of the shoulder. Theoretically, the beginning and end of the shoulder can be off.
I think I may try resizing the brass to see what happens. I guess I'm off to buy a bullet puller. A chamber OAL gauge will probably come in handy too.
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