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I usually call it "John Moses Browning's Greatest Achievement, The Forty-Five Automatic Slash Autoloading Cartridge Slash Colt Pistol Caliber Slash Pistol Format." It is a mouthful, but it keeps irrelevant conversation to a minimum.
45 ACP stands for Automatic colt pistol, It was a knew round made to be fired out of a semiautomatic pistol that was magazine fed, some what new technology for the time.
My 1942 vintage Colt New Service double action revolver is stamped on the barrel
"45 A.C.P." Maybe because Colts Patented Firearms Manufacturing Company named it what they wanted and probably knew what they were talking about.
Because that is what it is.
.45ACP is already a short way of saying what it is: .45 Automatic Colt Pistol.
when I hear "Colt .45" I assume that you are referring to ".45 Long Colt".
An entirely different cartridge that will prove quite troublesome if you try loading it into your M1911.
.45 Auto is what other companies call it so they don't have to put any reference to Colt on their knockoffs, even in abbreviation. Same reason Marlin and others got .44-40 into the vocabulary to replace .44 WCF (Winchester Central Fire.)
When Savage was making pistols pre WW I, they actually had ammunition loaded with headstamp .380 SAP for Savage Automatic Pistol, even though it was the same in all respects as .380 ACP. And Colt cataloged revolvers in .38 Colt Special which differed from .38 S&W Special only in the slightly flat bullet nose.
How about calling 9mm: 380 Long, since .380 is called 9mm Kurtz (short) in some countries.
I just say 45 but if I get a .45LC, or .45GAP or something I'll probably start adding ACP.
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