Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The Underwood 357 Magnum 125 grain Barnes TAC-XP bridges the gap between field-proven terminal performance and environmental compliance. Constructed from monolithic copper, the Barnes TAC-XP solid hollow point sheds no lead, retains 100% of its original weight through intermediate barriers, and expands reliably across a broad velocity window. At 1650 fps and 756 ft-lbs from a 6-inch test barrel, this load delivers magnum energy without the fouling or toxicity of conventional lead-core bullets. Underwood loads each round in nickel-plated brass with flash-suppressed powder — critical for low-light encounters where muzzle flash can compromise your sight picture. The 357 Magnum cartridge, introduced in 1935, remains one of the most versatile handgun calibers in North America, equally at home in revolvers, lever-action carbines, and single-shot specialty pistols.
Performance at a Glance
Underwood field-tests every ammunition SKU with real firearms in conditions that mirror defensive and hunting use. The Barnes TAC-XP bullet uses a deep hollow cavity and precision-engineered petals that peel back on impact, creating a wound channel without fragmenting. Nickel plating improves feed reliability, resists tarnish during long-term storage, and simplifies case prep for reloaders. Boxer-primed, non-corrosive, reloadable — these cases handle multiple loadings without the embrittlement historically associated with older nickel processes. Underwood sources all components and assembles all cartridges in the United States.
| Spec | Value |
|---|---|
| Caliber | 357 Magnum |
| Bullet weight | 125 grains |
| Bullet type | Barnes TAC-XP solid hollow point |
| Muzzle velocity | 1650 fps (6-inch barrel) |
| Muzzle energy | 756 ft-lbs |
| Rounds/box | 20 |
| Case | Nickel-plated brass |
| Primer | Boxer, non-corrosive |
| Lead free | Yes (monolithic copper) |
| Intended use | Self-defense |
| Manufacturer | Underwood Ammunition (USA) |
Pair this load with quality 357 Magnum ammo practice rounds to maintain proficiency without the cost of premium defensive bullets. Flash-suppressed powder and nickel cases ensure consistent ignition and smooth feeding across revolvers from Ruger, Smith & Wesson, and Colt, as well as lever-action carbines from Marlin and Henry.
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.
- Treat every firearm as if it is loaded. Keep your finger off the trigger until ready to fire. Never point the muzzle at anything you are not willing to destroy. Be certain of your target and what lies beyond it.
- Verify current state and local laws governing ammunition purchase, possession, and use. Some jurisdictions restrict hollow-point ammunition or impose magazine capacity limits that affect revolver speedloaders.
- This product contains copper, which California Proposition 65 lists as a substance known to cause reproductive harm. Lead-free does not mean risk-free — always wear eye and ear protection, shoot in well-ventilated areas, and wash hands after handling ammunition.
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