.357 SIG Load Data
The .357 SIG was developed in about 1993, and with a bullet diameter of .355 inch, you could describe it as a 9mm on steroids. Here's some load data to handload your own.
.357 SIG Handloads (Jeff G. Phillips photo)
January 04, 2019
By Lane Pearce
The .357 SIG case is basically a modified .40 S&W with a skimpy bottleneck stretched approximately 0.020 inch, so that it will hold the bullet more securely. It headspaces on the mouth, not the shoulder.
Federal's goal for the .357 SIG round was to essentially duplicate .357 Magnum ballistics (125-grain JHP at 1,300 fps) in an autoloading pistol. My favorite handloads listed below achieve that level of velocity, and some even exceed it. Care must be taken when handloading bottleneck pistol cartridges such as the .357 SIG, and particular attention to lubing and sizing cases as well as chamfering case mouths must be paid.
.357 SIG SAAMI Specs Industry maximum average pressure (MAP) for the .357 SIG is 40,000 psi.
Case: SpeerPrimer: Small PistolMax. Length: 0.865 in.Trim Length: 0.860 in.OAL Max (Factory): 1.140 in.Favorite .357 SIG Loads Bullet Powder Charge (grs.) Case Primer Muzzle Velocity (fps) Extreme Spread (fps) Standard Deviation (fps) Hornady 124-gr. HP/XTP AA No. 7 10.8 Speer CCI 500 1344 43 10 Hornady 124-gr. HP/XTP Power Pistol 9.1 Rem. CCI 500 1417 34 10 Sierra 125-gr. JHC True Blue 8.2 Zero CCI 500 1262 60 17 Speer 125-gr. TMJ VV N105 10.7 Zero Fed. 100M 1418 68 16 Hornady 147-gr. HP/XTP Power Pistol 7.4 Rem. CCI 500 1196 27 9 WARNING: The loads shown here are safe only in the guns for which they were developed. Neither the author nor InterMedia Outdoors Inc. assumes any liability for accidents or injury resulting from the use or misuse of this data.
