![]() 40 S&W, which due to a low bolt thrust helps extend the service lives of weapons. It operates at a relatively low maximum chamber pressure rating of 21,000 psi (140 MPa), compared to 35,000 psi (240 MPa) for both 9mm Parabellum and. ![]() 45 ACP round uses a 230- grain (14.9 g) round nose projectile that travels at approximately 830 feet per second (250 m/s) when fired from a government-issue M1911A1 pistol. 45 caliber was required in a new handgun cartridge. This experience and the Thompson–LaGarde Tests of 1904 led the Army and the Cavalry to decide that a minimum of. 38 Long Colt, had proved inadequate, motivating the search for a better cartridge. The round was developed due to a lack of stopping power experienced in the Moro Rebellion in places like Sulu. After successful military trials, it was adopted as the standard chambering for Colt's M1911 pistol. 45 Auto (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. ![]() Large (some makers are now using small) pistol
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