Skip to main content

.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 Load Data

.357 SIG Handloads (Jeff G. Phillips photo)

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
.357 SIG SAAMI Specs

Industry maximum average pressure (MAP) for the .357 SIG is 40,000 psi.

  • Case: Speer
  • Primer: Small Pistol
  • Max. Length: 0.865 in.
  • Trim Length: 0.860 in.
  • OAL Max (Factory): 1.140 in.
Favorite .357 SIG Loads
BulletPowderCharge (grs.)CasePrimerMuzzle Velocity (fps)Extreme Spread (fps)Standard Deviation (fps)
Hornady 124-gr. HP/XTP AA No. 7 10.8 Speer CCI 500 13444310
Hornady 124-gr. HP/XTP Power Pistol 9.1 Rem. CCI 500 14173410
Sierra 125-gr. JHC True Blue 8.2 Zero CCI 500 12626017
Speer 125-gr. TMJ VV N105 10.7 Zero Fed. 100M 14186816
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.

GET THE NEWSLETTER Join the List and Never Miss a Thing.

Recommended Articles

Recent Videos

Shooting Times Magazine Covers Print and Tablet Versions

GET THE MAGAZINE Subscribe & Save

Digital Now Included!


Give a Gift   |   Subscriber Services


Buy Digital Single Issues

Magazine App Logo

Don't miss an issue.
Buy single digital issue for your phone or tablet.

Buy Single Digital Issue on the Shooting Times App

Other Magazines

See All Other Magazines

Special Interest Magazines

See All Special Interest Magazines

GET THE NEWSLETTER Join the List and Never Miss a Thing.

Get the top Shooting Times stories delivered right to your inbox.

Phone Icon

Get Digital Access.

All Shooting Times subscribers now have digital access to their magazine content. This means you have the option to read your magazine on most popular phones and tablets.

To get started, click the link below to visit and learn how to access your digital magazine.

Get Digital Access

Not a Subscriber?
Subscribe Now

Enjoying What You're Reading?

Get a Full Year
of Guns & Ammo
& Digital Access.

Offer only for new subscribers.

Subscribe Now