The .357 Magnum, also known as the .357 S&W Magnum and as
the .357 Remington Magnum, is a revolver
created by Elmer
Keith, Phillip B. Sharpe, Colonel D. B. Wesson of firearms
& Wesson, and Winchester,
based upon Smith & Wesson's earlier .38
Special cartridge. The .357 Magnum cartridge was introduced in 1934, and its
use has since become widespread. This cartridge started the "Magnum"
era of handgun ammunition. In Europe, the cartridge is also known as the 9×33mmR.