Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
When you load 10mm Auto 180 grain Hornady XTP ammunition into your pistol, you’re selecting a round engineered for controlled expansion and deep terminal penetration. The 10mm Auto — introduced in 1983 as a high-velocity semi-automatic cartridge — delivers ballistics that bridge the gap between 9mm+P and .357 Magnum, making it a preferred choice for self-defense and woods carry. This Underwood load pushes a 180-grain Hornady eXtreme Terminal Performance (XTP) jacketed hollow point to 1300 feet per second from a 5-inch test barrel, generating 676 foot-pounds of muzzle energy. Flash-suppressed powder preserves night vision during low-light engagements, while nickel-plated brass cases resist tarnish, improve feeding across semi-automatic and revolver platforms, and simplify brass recovery for reloaders.
Performance at a Glance
Underwood loads to published velocity specifications using temperature-stable propellants and Boxer-primed, reloadable nickel-plated brass. The Hornady XTP projectile features a precisely controlled expansion cavity and serrated jacket segments that peel back reliably across velocities from 800 to 1500 feet per second. At 1300 fps, this 180-grain bullet achieves a sectional density of 0.161 and a G1 ballistic coefficient of 0.164 — numbers that translate to consistent penetration depth in ballistic gelatin testing. The nickel-plated case sheds moisture, resists corrosion when carried in leather or nylon holsters, and chambers smoothly in tight-tolerance 1911, Glock, and CZ pistols.
| Spec | Value |
|---|---|
| Caliber | 10mm Auto |
| Bullet weight | 180 grains |
| Bullet type | Jacketed Hollow Point (Hornady XTP) |
| Muzzle velocity | 1300 fps (5-inch barrel) |
| Muzzle energy | 676 ft-lbs |
| Rounds per box | 20 |
| Case | Nickel-plated brass |
| Primer | Boxer (non-corrosive) |
| Reloadable | Yes |
| Intended use | Self-defense, hunting |
| Manufacturer | Underwood Ammo (USA) |
This load performs across Glock 20, Colt Delta Elite, Springfield XD-M, and SIG P220 platforms without requiring aftermarket recoil spring changes. For shooters who carry in bear country or require a duty-grade self-defense round, the combination of XTP expansion reliability and Underwood’s full-power loading delivers consistent results. Find more options in our Underwood 10mm Ammo category.
Safe Handling & Compliance
Federal law requires purchasers to be at least 21 years old 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 at all times — treat every firearm as loaded, keep your finger off the trigger until ready to fire, never point the muzzle at anything you are not willing to destroy, and be certain of your target and what lies beyond it.
- Verify current federal, state, and local ammunition regulations before purchasing — some jurisdictions restrict hollow point or high-velocity ammunition for civilian possession.
- This ammunition contains lead components; exposure to lead during firing and handling may cause health risks. Wash hands thoroughly after range sessions and follow California Proposition 65 warnings if applicable in your state.
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