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Have you resized 'em at all? It wouldn't be unusual for fired cartridges to not fit back into the chamber. Even the one they were fired out of.
"...guessing this is my issue..." You measure 'em?
Where'd your load data come from. IMR3031 isn't listed on Hodgdon's site for any bullet weight.
Lee 2nd edition lists imr3031 for 6.5 x 55.
Yea, I measured them, but my Caliper was with a friend when I made the original post, so i didn't have the cartridge or OAL.