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Question by pudgexl29. Uploaded on March 15, 2013
idk about the .45 but 9mm Luger is a gun not a bullet caliber it just shoots 9mm
The .45 Colt, aka .45 Long Colt, is a rimmed revolver cartridge most often seen in single action "cowboy" guns. The .45 ACP is a short rimless cartridge originally seen in our old G.I. Colt Model 1911A1 semi-automatic pistols, and now still popular in many more modern production guns.
There are many 9mm cartridges and guns out there, including the 9mm Kurz (.380 ACP), the 9x18mm and the 9mm Largo, but the one usually referred to when you hear "9mm" spoken of is the popular 9mm Luger aka 9mm Parabellum or 9x19mm.
Although people commonly say just ".45 caliber" or "9mm" those are just measurements and are not precise descriptions of cartridges.
When most people say .45 caliber, them usually mean .45 ACP (Automatic Colt Pistol) which is the common round used in semiautomatic pistols. There are other .45 caliber cartridges, however, like the .45 Long Colt, .454 Casul, and many others.
Likewise, when people say 9mm, they usually mean the 9x19mm, 9mm Luger, 9mm Parabellum cartridge, which are all different names for the same common 9mm cartridge. There are other much less common 9mm cartridges, but in the US, it is a safe bet this cartridge is what people are referring to. I hope this clears things up a little.
.45 Colt is the true nomenclature for the revolver cartridge that "won the West" People have added 'Long' to help identify it from the .45 Automatic Colt Pistol(ACP), the original cartridge for the 1911 pistol.
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