The .357 Magnum was introduced in 1935 and was the first magnum revolver cartridge. It was a joint effort between Smith & Wesson and Winchester and has become widely popular due to its unusual versatility.

When handloading the 140-grain Hornady Flex Tip bullet, due to its nose length, cases must be trimmed to 1.240 inch to retain industry overall cartridge length of 1.590 inches and function in all firearms. However, if this bullet is being used in a revolver that allows longer overall cartridge lengths, it can be seated in standard length cases of 1.290 inches.