The original Magnum Cartridge. It predates the .357 Mag and continued to be produced by Smith and Wesson for decades after WWII.
Originally used in the S&W Outdoorsman, the first gun to use Magna Stocks, when S&W switched to numbering their pistols It was dubbed the M20. Production ceased in 1966. The balistics are equal and sometimes greater than the .357 Mag.
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