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The 10mm Automatic cartridge typically fires a 40 caliber 180gr bullet at velocities approaching 1300 ft/sec (with the once-available 'full-power' loads or by using handloads of maximum pressure). It was developed by the FBI partially as an attempt to increase the lethality of handgun bullets as a result of the tragic 'Miami Shootout' in 1986, in which two FBI agents lost their lives and many others were seriously wounded in a gun fight with bank robbery suspects.
Handguns firing this cartridge are typically 'large frame' semi-automatics, such as 1911-style handguns. Glock is a notable exception, chambering one of their compact pistols (Glock 29) for this cartridge. Featuring recoil similar to the .45ACP, the increased velocity of this cartridge plus the smaller diameter, increases its performance against hard barrier materials such as windshield glass and car doors. This increased penetration is obtained at the expense of decreased wounding efficiency in a tissue simulant, due to the higher velocity.
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