You must have sloppy chambers.
New 45 ACP measures ID .449-.450, fired measure .450-.451 which means a .452 hard cast wouldn’t fit.
Didn’t measure the others are .001-.002 undersized for proper tension.
"I must have sloppy chambers." I don't think so.
I posted examples of three of my pistols where in only one of them a sized cast bullet would fit all the way inside a fired case. I think that my response to @tcp should have not have been YES, but it should have been NO or MAYBE, depending on how tight the pistol's chambers are.
Since all cases expand when the cartridge is fired, and after firing there is no bullet for the case neck to hold, there is no "proper tension" for the mouths of fired cases. There is only proper tension for the mouths of sized cases.
