Answer
Jul 31, 2025 - 12:56 PM
The term "45 ACP" refers to a specific cartridge known as the .45 Automatic Colt Pistol, which was designed by John Browning for use in semi-automatic pistols. On the other hand, "45 caliber" is a broader term that refers to the diameter of the bullet, approximately 0.45 inches, and can apply to various types of cartridges and firearms, including the .45 ACP, .45 Colt, and others. Essentially, while all .45 ACP rounds are .45 caliber, not all .45 caliber bullets are .45 ACP.
