It has relatively low muzzle blast and flash, and it produces moderate recoil in handguns, made worse in compact models.The standard issue military .45 ACP round has a 230-grain bullet that travels at approximately 830 feet per second when fired from the government issue M1911A1 pistol and approximately 950 feet per second from the M1A1 Thompson submachine gun.The very first production, at Frankford Arsenal, was marked "F A 8 11", for the August 1911 date. Thompson insisted on a real "man stopper" pistol, following the poor showing of the Army's .38 Long Colt pistols during the Philippine–American War (1899–1902). The common rifling twist rate for this cartridge is 406 mm (1 in 16 in), 6 grooves, Ø lands = 11.23 mm, Ø grooves = 11.43 mm, land width = 3.73 mm and the primer type is large pistol. while the SAAMI pressure limit for the .45 ACP P is set at 23,000 psi (158.58 MPa), piezo pressure.
the British had similar lack-of-stopping-power issues switching to the .303 British, which resulted in the development of the dum-dum bullet in an attempt to compensate for the round's deficiencies.
The resulting .45-caliber cartridge, named the .45 ACP, was similar in performance to the .45 Schofield cartridge, and only slightly less powerful (but significantly shorter) than the .45 Colt cartridges the Cavalry was using. Over time, a series of improved designs were offered, culminating in the adoption in 1911 of the "Cal.
By 1906, bids from six makers were submitted, among them Browning's design, submitted by Colt. DWM, which submitted two Parabellum P08s chambered in .45 ACP, withdrew from testing after the first round of tests, for unspecified reasons. The cartridge/pistol combination was quite successful but not satisfactory for U. .45 Automatic Pistol Ball Cartridge, Model of 1911", a 1.273 in (32.3 mm) long round with a bullet weight of 230 grains (15 g). regulated countries are currently (2016) proof tested at 170.30 MPa (24,700 psi) PE piezo pressure.
Drawbacks for military use include the cartridge's large size, weight, increased material costs in comparison to the smaller, flatter shooting NATO standard 9×19mm Parabellum cartridge, which uses less powder, brass, and lead per round.
Standard 9mm NATO ammunition has limited armor penetration capability − a deficiency with .45 ACP whose large, slow bullet does not penetrate armor to any great extent.
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