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Modern 45 ACP ammunition is a very effective combat cartridge and is widely used throughout the world. The .45 ACP is notable for its accuracy, high velocity stopping power and low muzzle flash. A chamber pressure rating of only 21,000 psi extends the life of weapons that fire this round.
In the early prior century, the United States Cavalry requested that Colt produce a .45-caliber cartridge after deciding that a minimum of .45-caliber rounds in their handguns was what they wanted. Colt introduced the .45 ACP ammo for sale in 1905. The combination of stopping power and controlled penetration of .45 ACP ammunition makes it a good choice for both military and police use, but the smaller magazine capacity and larger size/weight ratios of weapons that are chambered in 45-caliber have seen many go to 9mm pistols instead.
Many U.S. tactical police units use .45 ACP ammo, including but not limited to certain FBI units. Weapons that are chambered for .45 cal ammunition require longer and wider grips, which make them less suitable for small hands. Although most NATO units now use 9mm cartridges, the popularity of the 45 ACP ammo cartridge is still widely used in the United States for sport shooting and self defence ammo.