.45 ACP
The .45 ACP (Automatic Colt Pistol) pistol cartridge was designed by firearms designer John Browning. Based upon his earlier .380 ACP pistol cartridge, the .45 ACP was introduced along with Colt M1911 pistol adopted by the US Army in 1911. The round was later used in several submachine guns.
Design
The US Cavalry, based on testing in battle, decided that existing .38 caliber pistol cartridges appearing in the early 1900s were not adequate to replace the current cavalry revolver, a .45 Colt Single Action Army. The US Cavalry demanded stopping power similar to the .45 Colt cartridge (sometimes erroneously called the ".45 Long Colt"). Colt had been working with Browning on a .41 caliber cartridge in 1904, and in 1905 when the Cavalry asked for a .45 caliber equivalent, Colt modified the pistol design to fire a .45 caliber version of the prototypical .41 caliber round. The original round that passed the testing fired a 200 grain (13 g) bullet at 900 ft/s (275 m/s), but was later changed to a 230 grain (15 g) bullet at about 850 ft/s (260 m/s). The resulting .45 ACP cartridge is similar in performance to the .45 S&W cartridge, and thus slightly less powerful than the .45 Colt cartridge.
Performance
The result is one of the world's most effective combat pistol cartridges, one that combines very good accuracy and stopping power for use against human targets. The cartridge also has relatively low muzzle blast and flash, as well as moderate recoil. Like most pistol cartridges, it is a low-velocity round, and thus not effective against body armour. Another drawback for large-scale military operations is the bullet's large size and greater material costs in manufacturing compared to the 9 mm Luger cartridge.
Even in its full metal jacket form the .45 ACP cartridge has a reputation for effectiveness against human targets, because its large bullet creates a deep and substantial wound channel. Hollow-point configurations increase the expansion and energy-transfer potential of the round.
Being a moderate-powered round on the energy scale, .45 ACP bullets have little tendency to overpenetrate, which otherwise results when a projectile passes through an intended target with enough velocity to injure another person. The combination of stopping power and controlled penetration makes the .45 ACP practical for police use. Many US hostage rescue teams prefer the .45 ACP because of these qualities.
Today most of the US military uses the 9 mm Luger cartridge, but the accuracy of the .45 ACP cartridge has ensured its continued popularity with large caliber sport shooters. Many US Special forces and police units (such as SFOD-D, more commonly known as Delta Force) still use this round in the form of modified 1911A1s and Heckler und Koch's SOCOM Mk. 23s and USP Tacticals.
Muzzle velocity
- 14.7 g (230 gr) Full Metal Jacket: 260 m/s (860 ft/s)
- 11.9 g (185 gr) CCI/Speer Gold Dot JHP (from 5in (127 mm) barrel): 317 m/s (1041 ft/s)
- 14.7 g (230 gr) Federal Hi-Shok JHP (from 5 in (127 mm) barrel): 260 m/s (860 ft/s)
+ P loads
- 11.9 g (185 gr) JHP: 350 m/s (1150 ft/s)
- 14.7 g (230 gr) JHP: 290 m/s (950 ft/s)
Load variants
Several manufacturers market pre-loaded .45 ACP rounds in sizes ranging from 117 to 230 grains (8 to 15 g), with the most popular commercial load being the standard military loading of a 230 grain (15 g) FMJ bullet at around 850 ft/s (260 m/s). Specialty rounds are available in weights under 100 grains (6.5 g) and over 260 grains (16.8 g); popular rounds among reloaders and target shooters include 185 and 230 grain (12 and 15 g) bullets. Hollowpoint rounds intended for maximum effectiveness against live targets are designed to expand upon impact with soft tissue, both increasing the energy transferred from the round to the target and enhancing the wound-creating power of the expanded round. Some ammo brands came under fire from anti-gun groups, and are now only sold to qualified law enforcement purchasers.
Synonyms
- .45 Auto
- 11.43 x 23 mm
Weapons using the .45 ACP
- M1911
- HK USP45 (Also Compact, Match, and Tactical variations)
- HK SOCOM Mk. 23
- HK UMP45
- Beretta 8000 Cougar
- Thompson submachine gun
- Reising
- M3 "Grease Gun"
- MAC-10
- M16K
- De Lisle carbine rifle
- FP-45 Liberator
- GLOCK 21, GLOCK 30, GLOCK 36
- Sig P220 (Also R and ST variations)
- S&W .45 Hand Ejector US Service Model of 1917 (US - Revolver - .45 ACP)
- S&W Model 25-2 (Revolver - .45 ACP: Model of 1955 Target)
- S&W Model 625 (US - Revolver - .45 ACP: Model of 1988 .45 Target Stainless)
- S&W Model 625 Mountain Gun (US - Revolver - .45 ACP: Model of 1989 .45 Light Weight 39.5 oz)