.45 ACP (.45 Automatic) is a large-diameter centerfire handgun cartridge with a long history in self-defense and target shooting, known for a heavy bullet at modest velocity.

.45 ACP is a classic American pistol cartridge that fires a large, heavy bullet at relatively low velocity, producing a distinctive 'push' style of recoil that many shooters find manageable in a full-size handgun. It has a long-standing reputation for self-defense and is also popular in target and competition shooting. Ammunition is widely available, though typically more expensive per round than 9mm, and magazine capacity tends to be lower for a comparably sized pistol. It suits shooters who prefer a larger-caliber handgun and do not prioritize maximum capacity or the lowest ammunition cost.

General information about this caliber — not a recommendation for this specific firearm.