Nothing, .45 auto is just another name for .45ACP.
No. 45 ACP is approximately 11.5 millimeters, so 10mm is slightly smaller in diameter.
There is no difference. ACP stands for Automatic Colt Pistol.
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To indicate the caliber and manufacturer, or specific type of cartridge. For example: .22LR means 22 long rifle, which is different that a .22 short. .40 S&W means .40 Smith and Wesson, etc. which is different than a 10mm, even though a 10mm is .40 inches in diameter. .45 ACP stands for .45 Automatic Colt Pistol, which is different than .45 GAP, which stands for .45 Glock Auto Pistol.
ACP means Automatic Colt Pistol. .45 ACP and .45 Auto are the same cartridge. .45 Colt and .45 Auto Rim are a revolver cartridge. .45 GAP (Glock Auto Pistol) is a shorter round than the ACP, and does not interchange with it.
.45 ACP means Automatic Colt Pistol. It IS .45 Auto.
No. The 45 ACP (which means 45 Auto) cannot use the .45 GAP or the .45 Magnum.
Both. .45 Auto and .45 ACP are the same round.
45 ACP can be used in both auto and revolver. The revolver must have a 45 ACP cylinder.
Nothing, .45 auto is just another name for .45ACP.
Yes
You can fire a .45 ACP cartridge through a .45 ACP pistol - and only a .45 ACP pistol. The various .45 cartridges (.45 ACP, .45 Long Colt, .45 GAP, etc.) are not interchangeable with each other.
ACP and auto are used to say the same thing. Automatic Colt Pistol.
Nothing, two names for the same round.
Automatic Colt Pistol. Colt invented the .45 Auto and thus had the right to name it.
Yes, .45 ACP.