Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For revolvers and carbines chambered in 357 Magnum, Underwood’s 125 grain Hornady XTP load clocks 1700 fps and 802 ft-lbs from a 6-inch barrel. That velocity pushes the eXtreme Terminal Performance hollow point to expand while retaining weight through barriers — controlled expansion with deep penetration is how Hornady engineers the XTP ogive and jacket thickness. Underwood pairs this projectile with flash-suppressed powder and nickel-plated brass for reliable function in low light and humid storage.
Performance at a Glance
Each XTP bullet seats in nickel-plated brass that resists tarnish and feeds cleanly through cylinder throats and lever actions. Non-corrosive Boxer primers seat flush, and the cases reload dozens of cycles without splitting. Underwood loads this ammunition at their facility in the United States, testing each lot with the same revolvers and carbines you carry. Brand name written in plain prose per policy.
Specs at a Glance
| Spec | Value |
|---|---|
| Caliber | 357 Magnum |
| Bullet weight | 125 grains |
| Bullet type | Hornady XTP jacketed hollow point |
| Muzzle velocity | 1700 fps (6-inch barrel) |
| Muzzle energy | 802 ft-lbs |
| Rounds/box | 20 |
| Case | Nickel-plated brass |
| Primer | Boxer, non-corrosive |
| Reloadable | Yes |
| Intended use | Self-defense |
| Country of origin | United States |
This load sits in the middle of the defensive 357 Magnum spectrum — fast enough to expand the XTP cavity without over-penetration in typical home-defense scenarios. Underwood tests every lot with real-world firearms, not laboratory barrels. You’ll find more defensive and range loads in our 357 Magnum ammo catalog.
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.
- Observe the four universal firearms safety rules: treat every firearm as loaded, never point at anything you are not willing to destroy, keep your finger off the trigger until ready to fire, and know your target and what lies beyond it.
- Verify that your firearm is rated for +P or full-power 357 Magnum loads before firing this ammunition — some older revolvers and replica firearms are chambered for 38 Special only.
- This product contains lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling ammunition and components. Use adequate ventilation when shooting indoors.
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