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40 S&W Ammo
The .40 S&W (10×22mm Smith & Wesson) is a rimless pistol cartridge developed jointly by major American firearms manufacturers Smith & Wesson and Winchester.
The .40 S&W was developed from the ground up 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 (9mm size) automatic handguns. The .40 S&W is one of the most proven, best handgun calibers in production today and shared popularity for many years with 9mm and 45 Autos in every manufacturer's pistol line.