Today's 45 ACP ammo for sale is one of the most effective combat cartridges in the world, combining accuracy and stopping power with a low muzzle flash and moderate recoil. The .45 ACP also extends the usability of weapons in which it is used by operating at a maximum chamber pressure rating of only 21,000 psi.
In the early 1900s, the United States Calvary requested that Colt produce a .45-caliber cartridge after deciding that minimum of .45-caliber was required for all handguns in 1904. The next year, in 1905, Colt lived up to this request by introducing 45 ACP ammo for sale on the market. The original 45 ACP cartridge fired a 13 g bullet at 900 ft/s, but after a number of revisions, it eventually wound up a 15 g bullet fired at about 850 ft/s.
The finished 45 ACP ammunition was similar to the .45 Schofield cartridge, yet slightly less powerful than the .45 Colt cartridges that were used by the cavalry. In the in 1910, the second round of evaluations occurred, and the original Colt design went through extensive testing with absolutely no failures, yet 37 stoppages and/or part failures were reported for the Savage edition. Thus, the Colt design was officially adopted as Model 1911.
The stopping power of bullets is usually characterized in terms of the bullet’s penetration depth, expanded diameter, and energy. The bullet energy for most 45 ACP ammo for sale today can be anywhere from 350 to 500 ft·lbf. Since 45 ACP is a moderately powered cartridge, the wide diameter of the .45 ACP bullets is not likely to pass through a target with enough velocity to puncture another target.
The combination of controlled penetration and stopping power of the 45 ACP ammunition on sale today makes it practical for military and police use, however the smaller magazine capacity and larger size/weight of pistols that are chambered in 45-caliber have led more agencies in the U.S. to adopt sidearms in 9mm Parabellum instead.
Still, many U.S. tactical police units still use .45 ACP ammo, including but not limited to the FBI Hostage Rescue Team. Pistols that are chambered for 45-caliber ammo require longer and wider grips, which means they are not very suitable for shooters with small hands. Although most NATO militaries now use pistols chambered for the 9mm Parabellum cartridge, the popularity of the 45 ACP cartridge is still seen heavily in the United States, where it is commonly used for sport shooting.
