Description
The CorBon 357 SIG 125gr DPX load is built for shooters who want more from their .357 SIG than typical factory ammunition delivers. CorBon loads a 125 grain DPX solid copper hollow point to a rated 1300 feet per second, producing about 505 foot-pounds of energy from a 4 in barrel. The DPX bullet uses internal serrations so it opens into six sharp copper petals while keeping 100 percent of its original weight.

Why Choose the CorBon 357 SIG 125gr DPX
- 125 grain DPX solid copper hollow point
- Rated 1300 fps and 505 ft-lbs from a 4 in barrel
- 12 to 18 in of soft-tissue penetration in CorBon testing
- Retains full weight after heavy barriers
- 20 rounds per box, item DPX357SIG125-20
Built for Personal Protection
- Barrier-blind performance through auto glass and steel
- Lead-free and legal for use in California
- Smooth feeding in duty and carry pistols
- Made in the USA
Buying ammunition by the box from the same production lot keeps velocity and point of impact consistent from one range trip to the next. Keep a record of the load you carry, check your ammunition for dents or loose bullets from time to time, and rotate your carry rounds so the ones in your firearm stay fresh. These simple habits help you get the full performance CorBon builds into every cartridge.
Before you trust any new load, fire enough rounds through your firearm to confirm it feeds, fires and ejects reliably and that the point of impact matches your sights. Full-power loads produce more recoil and muzzle blast than typical range ammo, so practice with the CorBon 357 SIG 125gr DPX until you are comfortable with it, and store the rest in a cool, dry place in the original box.
The .357 SIG was introduced by SIG Sauer and Federal in 1994 to match the performance of a .357 Magnum 125 grain load from a semi-automatic pistol. Its bottleneck case feeds very reliably, and the high velocity gives good barrier penetration, which is why it has been adopted by several state and federal agencies. A solid copper bullet like DPX is a natural match for that speed.
Specifications
- Brand: CorBon Ammunition
- Product Line: DPX
- Caliber: .357 SIG
- Bullet Weight: 125 grains
- Bullet Type: DPX solid copper hollow point
- Muzzle Velocity: 1300 fps (4 in barrel)
- Muzzle Energy: 505 ft-lbs
- Case: Brass
- Quantity: 20 rounds
- Item Number: DPX357SIG125-20
- UPC: 757750035713
Why Choose CorBon 357 SIG Ammo
Officers and armed citizens who carry a .357 SIG want 357 sig defense ammo that performs the same through clothing, glass or sheet metal. CorBon DPX was designed for exactly that, and it keeps its full weight and shape after barriers that break apart many lead-core hollow points.
The 357 sig 125 grain solid copper bullet leaves the muzzle at about 1300 fps with roughly 505 ft-lbs of energy from a 4 inch barrel. Its internal serrations let it double in diameter with six petals, producing a larger and more consistent wound cavity than many conventional loads.
CorBon has built premium defensive ammunition in Sturgis, South Dakota since 1982, and its DPX line was developed following FBI testing protocols. Every DPX bullet is solid copper and certified lead-free, and corbon 357 sig ammo in the DPX line is known for holding together after heavy barriers such as auto glass.
This ammunition is a good fit for owners of the SIG P229, SIG P320, Glock 31, 32 and 33 and other .357 SIG pistols who want a dependable barrier-blind load for duty or concealed carry. Always confirm your firearm is chambered for .357 SIG, wear eye and ear protection, and follow all federal, state and local laws.
Browse more ammunition at Mag 5 Firearms, or visit CorBon Ammunition for more about their full line of loads.









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