The .45 ACP (11.43×23mm) (Automatic Colt Pistol), also known as the .45 Auto by C.I.P., is a cartridge designed by John Browning in 1904, for use in his prototype Colt semi-automatic .45 pistol and eventually the M1911 pistol adopted by the United States Army in 1911.
Performance:
The .45 ACP is an effective combat pistol cartridge that
combines accuracy and stopping power for use against human targets. The
cartridge also has relatively low muzzle blast and flash, as well as moderate
recoil. The .45 ACP also operates at a relatively low maximum chamber pressure
rating of 21,000 psi (145 MPa) (compared to 35,000 psi/240 MPa for 9mm
Parabellum and .40 S&W, 37,500 psi/260 MPa for 10mm Auto, 40,000 psi/280
MPa for .357 SIG), which due to a low bolt thrust helps extend service life of
weapons in which it is fired. Even in its non-expanding full metal jacket (FMJ)
version, the .45 ACP cartridge has a reputation for effectiveness against human
targets because its large diameter creates a deep and substantial permanent
wound channel which lowers blood pressure more rapidly.
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