<Tr> <Td_colspan="2"> Test barrel length: 4 in (102 mm) (vented) Source (s): Federal, </Td> </Tr> <P> The . 357 S&W Magnum (9 × 33mmR), or simply . 357 Magnum, is a revolver cartridge with a . 357 - inch (9.07 mm) bullet diameter . It was created by Elmer Keith, Phillip B. Sharpe, and D.B. Wesson of firearms manufacturers Smith & Wesson and Winchester . </P> <P> It is 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 . </P> <P> The . 357 Magnum cartridge is notable for its highly effective terminal ballistics when used for hunting or defense . </P>

What is the effective range of a 357 magnum