I, too, have read about rifle brass stretching in the sizing die but often wondered if it could happen to a short, straight walled case like 45 Colt brass.
I guessed that the case was getting longer and shorter due to the bodies O.D. expanding and contracting.
My 45/70 brass does this too and it's not going through a carbide die of course, so I'm wondering if any of the sizing process is causing case stretch. I guess if I get a head separation I'll know more?
