Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
When you load 357 Magnum 158 grain SJHP into your revolver, you’re banking on a load engineered for one job: stopping threats. Winchester Big Bore ammunition uses a semi-jacketed hollow point design that controls expansion—delaying cavity formation until the projectile reaches optimal depth, then opening to produce massive shock and lethal wound channels. At 1460 fps and 748 ft-lbs from the muzzle, this 158-grain load delivers energy levels that justify the 357 Magnum’s reputation as a proven man-stopper. Winchester has built this cartridge for shooters who need reliable terminal performance in personal defense and hunting applications where penetration and controlled upset matter more than velocity alone.
Load Profile
The 158-grain semi-jacketed hollow point sits at the heavy end of the 357 Magnum spectrum—heavy enough to penetrate barriers and retain momentum through heavy clothing, yet engineered to expand once it reaches tissue. The semi-jacket leaves the base and nose exposed, allowing the hollow point to initiate expansion while the jacket controls fragmentation. Muzzle velocity of 1460 fps puts this load squarely in the high-performance tier for 357 Magnum defense rounds, outpacing lighter-grain options while maintaining the sectional density that drives deep penetration. Brass cases and Boxer primers make this load reloadable for shooters who work up their own batches, though the consistent ignition and chamber pressure of factory-fresh components deliver reliability when you need it most.
Specs at a Glance
| Spec | Value |
|---|---|
| Caliber | 357 Magnum |
| Bullet weight | 158 Grains |
| Bullet type | Semi-Jacketed Hollow Point |
| Muzzle velocity | 1460 fps |
| Muzzle energy | 748 ft-lbs |
| Rounds per box | 20 |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Lead-free | No |
| Intended use | Self Defense |
| Manufacturer | Winchester |
Shooters running 4-inch service revolvers or carbine-length lever guns will see this load reach its advertised velocity. Shorter barrels sacrifice 50-100 fps but still deliver energy levels that justify carry confidence. This ammunition ships in 20-round boxes—enough to load your cylinder multiple times for carry rotation and verify point of impact without burning through an entire case. For 357 Magnum ammo stockpiles, consider ordering multiple boxes to maintain consistent lot numbers across your defensive rotation.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities—review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Follow the four universal rules of firearm safety when loading and unloading live ammunition.
- Verify current federal, state, and local laws governing ammunition possession and use in your jurisdiction before ordering.
- This ammunition contains lead. Wash hands after handling, and follow all manufacturer warnings regarding exposure to lead and combustion byproducts.
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