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The Ultimate Reloading Manual
Wolfe Publishing Group
  • reloading manual
  • alliant reloading data
  • reloading brass
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The Ultimate Reloading Manual
hodgdon load data

.357 Magnum (Handgun)(using Hornady bullets)

Author: Brian Pearce / Wolfe Publishing Co.
Date: Aug 30 2012

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.

A heavy roll crimp is suggested with jacketed bullet loads, while lead bullet data can benefit from either a medium roll crimp or taper crimp.

Jacketed bullet data should not be reduced below "start" loads. Winchester small pistol magnum primers were used throughout; however, data used with lead bullets will generally give improved accuracy and lower extreme spreads with non-magnum primers.