FAVORITE LOADS: HOT OFF THE PRESS
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
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|
| 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.|