.357 Sig Ammo.
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.357 SIG packs .357 Magnum-class velocity into a compact semi-auto cartridge. Its bottleneck case feeds reliably and drives 124 to 125 grain bullets fast, which made it a favorite with several federal and state agencies. At Gunners Outlet we carry .357 SIG ammunition from Speer, Fiocchi and others, with FMJ for training and hollow points for duty and defense. Order online and we ship fast from our New Hampshire warehouse. Compare loads easily with the price per round shown on every listing.
About .357 SIG Ammunition
SIG Sauer and Federal introduced the .357 SIG in 1994 by necking down a .40 S&W case to hold a 9mm diameter bullet. The goal was to match the performance of a 125 grain .357 Magnum revolver load in a semi-auto pistol, and it comes close.
Most .357 SIG loads use 124 or 125 grain bullets at high velocity, which gives a flat trajectory and strong energy for a pistol round. The bottleneck shape also feeds very smoothly. The tradeoffs are sharper recoil and more blast than 9mm, plus ammo that costs more and is harder to find.
Many .40 S&W pistols can switch to .357 SIG with just a barrel change, since both share the same magazines and case head. For defense, choose a bonded hollow point such as Speer Gold Dot. For practice, FMJ keeps cost down. Buying by the box or in bulk helps you keep this less common cartridge on hand.
Who Uses .357 SIG?
Agencies such as the U.S. Secret Service, the Federal Air Marshals and several state police forces adopted .357 SIG because of its velocity and strong performance through car doors and windshields. Many have since moved to 9mm for cost and recoil, but plenty of shooters still choose .357 SIG for its flat trajectory.
Because .357 SIG headspaces on the case shoulder, it chambers very reliably. If you already own a .40 S&W pistol, a conversion barrel is an affordable way to try it.
.357 Sig Ballistics Table
| Bullet Weight | Bullet Type | Loads | Brands | Price From |
|---|---|---|---|---|
| 124 gr | FMJ | 1 | 1 | $0.44/rd |
| 125 gr | FMJ | 2 (2 in stock) | 1 | $0.57/rd |
Frequently Asked Questions
357 sig vs 9mm: which is better?
.357 SIG is faster and carries more energy, while 9mm is cheaper and easier to shoot. With modern hollow points, 9mm performs well for most people. Choose .357 SIG if you want maximum velocity and barrier performance in a semi-auto.
357 sig vs 40: which is better?
.357 SIG shoots flatter and faster, while .40 S&W uses heavier bullets and its ammo is more common. Both have similar energy. Many pistols convert between the two with a barrel swap, so you can try both.
357 sig vs 357 magnum: which is better?
.357 Magnum is more versatile and can be loaded heavier, while .357 SIG matches its 125 grain performance in a semi-auto. For a revolver and hunting choose .357 Magnum; for a duty pistol .357 SIG offers similar velocity with more capacity.
What is the best 357 sig ammo?
The best .357 SIG ammo for defense is a bonded hollow point like Speer Gold Dot, while 125 grain FMJ is best for practice. Test your defensive load in your own pistol for reliable feeding.