This idea that .45acp now comes in small primer has intriqued me. After all these years of large primer, why would they change up and ad a new size into the mix? So I did some research, and find that the .45 GAP is basically a short .45 acp case, and it uses small primers. The max length of .45 acp case is .898, while the max length of the .45 GAP case is .760.
I don't have any small primer .45's, so I would like to ask someone with these and who has a dial caliper, if they would gauge their cases, comparatively. I'm just thinking that the small primer stuff is not really intended for the .45 acp, but is actually .45 GAP.
So there in lies the question, is it safe to fire a .45 GAP in a .45 ACP pistol? Will it headspace correctly enough to be safe? Is that .122 case length difference okay? In a revolver I would say yes, but in a semiauto, I think no. The cartridge headspaces on the case mouth, so you can't seat the bullet shallower to make up the difference in OAL, and you'll have that gap between the case and the bolt face. And even if it fired correctly, what are the effects of the extraction?
Anyone smarter than I (that would be most of you) have an answer?
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