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40 Smith & Wesson

The .40 S&W (10×22mm Smith & Wesson) is a rimless pistol cartridge developed jointly by major American firearms manufacturers, Winchester and Smith & Wesson. The .40 S&W was developed from the ground up as a law enforcement cartridge designed to duplicate performance of the FBI's reduced velocity 10mm cartridge which could be retrofitted into medium-frame (9mm size) automatic handguns. It uses .40-inch (10.16 mm) diameter bullets ranging in weight from 125 to 200 grains (9 g to 13 g). A number of loads with hollow point bullets offer a good combination of expansion, penetration, temporary cavitation, and sufficient energy transfer to impart hydrostatic shock.

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