Over its relatively short lifetime, the 40 S&W has quickly become a very popular cartridge for both law enforcement departments and civilians. Introduced in 1990, it was the result of the combined effort of Smith & Wesson and Winchester to produce a 40 caliber cartridge that would have the energy of a 45 ACP cartridge, while fitting into a 9mm frame (semi-automatic). The earlier 10mm cartridge had some interest from the law enforcement community, however, many considered it to be overpowered and the pistols to be too bulky for police use. The 40 S&W is basically a lightly loaded 10mm Auto with a shorter case (and less propellant), offering greater magazine capacity than the 45 ACP.

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