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.357 SIG


Courtesy of Sierra.

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. It is one of my favorite cartridges.

The 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.

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

.357 SIG
Case: Speer
Primer: Small Pistol
Max. Length: 0.865 in.
Trim Length: 0.860 in.
OAL Max (Factory): 1.140 in.

Lane's 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.

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