.40 S&W

The .40 S&W (10.2x21mm) is a rimless pistol cartridge developed jointly by Smith & Wesson and Winchester in 1990. The .40 S&W was developed as a law enforcement cartridge designed to duplicate performance of the Federal Bureau of Investigation's reduced-velocity 10mm Auto cartridge which could be retrofitted into medium-frame semi-automatic handguns. 

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