The cartridge used in this weapon is the standard United States .25 Automatic Colt Pistol cartridge. This cartridge is known in Europe and South America as the 635mm Browning cartridge. It uses a powder charge of about 1.5 grains of smokeless and fires a 50-grain metal jacketed lead bullet. It develops a muzzle velocity of about 755 feet per second, has a striking energy at the muzzle of about 71 foot pounds and at 15 feet will penetrate 3 pine boards, %-inch thick.
While this pistol is not considered an effective side arm in the United States, it has tremendous vogue throughout the rest of the world as a personal protection arm. It is the second most popular pistol caliber in the world, the first being the .32 Automatic Colt Pistol cartridge, known in Europe as the 7.65mm Browning cartridge.
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