I was in the process of loading up .45ACP rounds using previously fired brass, mostly my own, but some range brass was included. I was going through measuring lengths and came up with a few that were too short, I pu them aside figuring they were .45GAP. Afterwards, I looked again at the short cases and they were all headstamped .45 AUTO, huh, weird. After checking the case length of .45GAP, the casings in question are too long. Take a look: Sorry for the blur, best the camera can do. Case lengths form L to R: 0.898(.45AUTO), 0.830 (?), 0.753 (.45GAP) What would be the reason for oddball case length? The only thing I can figure is someone using them with a revolver.