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.45 ACP

The .45 ACP, also known as .45 Auto, .45 Automatic, or 11.43×23mm is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol. After successful military trials, it was... Wikipedia
Decibels: 157.0 dB
Bullet diameter: .452 in (11.5 mm)
Case capacity: 25–27.4 gr H2O (1.62–1.78 cm3)
Designed: 1904
Maximum pressure (CIP): 19,000 psi (130 MPa)
Rifling twist: 1 in 16 in (406 mm)
Variants: .45 ACP +P,.45 Auto Rim,.45 Super,.460 Rowland