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This is 10mm ammunition built on a proven design that prioritizes penetration and terminal performance in real-world situations. The 115-grain solid copper bullet leaves the barrel at 1700 feet per second with 738 foot-pounds of muzzle energy, delivering high velocity in a lightweight package that generates less felt recoil than heavier alternatives.
Underwood engineered these rounds with precision-machined flutes in the nose that create cavitation and wound channel effects despite the solid copper construction. Rather than relying on traditional expansion, the design forces hydraulic energy inward to build pressure within the target. The solid copper body won't break apart when passing through barriers like drywall, car glass, or heavy clothing, so the performance remains consistent regardless of what stands between you and the threat.
These are new production rounds loaded in nickel-plated brass cases that resist corrosion far better than standard brass. The nickel plating helps ammunition feed flawlessly through different firearm actions and makes cleanup during reloading much easier if you're into hand-loading. All rounds are boxer-primed and non-corrosive, so they're safe for your barrel and reloadable if you want to stretch the value of your brass.
Every box contains 20 rounds and comes factory-tested in real firearms that customers actually use. Underwood uses flash-suppressed powder throughout their lineup, so your vision stays sharp if you ever need to take a follow-up shot in low light.
The Xtreme Defender uses a solid copper body with milled flutes in the nose instead of relying on expansion. Those flutes create cavitation and wound channel effects, and because the bullet doesn't expand, it won't fragment when passing through barriers like walls or heavy clothing. The solid construction ensures performance stays consistent regardless of what's in the way.
Yes, but velocity will be slightly lower from shorter barrels. The 1700 fps rating is typically achieved from full-size handgun barrels. Some users report needing to verify round fit in their chamber before carrying, as tight tolerances on some firearms may require a quick function check.
It's suitable for both. The light 115-grain bullet generates significant velocity and penetration that works well for medium game at handgun distances. For self-defense, the low-recoil profile relative to heavier 10mm loads makes follow-up shots faster and easier while still delivering serious power.
Absolutely. The nickel-plated brass is reloadable and actually offers advantages over bare brass. It resists corrosion better during storage and the nickel plating makes cleanup easier. The Ducta-Bright 7a plating process Underwood uses won't embrittle the brass like some older nickel plating methods.
| Caliber/Gauge | 10mm |
|---|---|
| Case Material | Nickel-Plated Brass |
| Cost per Round | 1.60 |
| Grains | 115 gr |
| Length | 3.1500 |
| Manufacturer | |
| Manufacturer Part Number | 810 |
| Shipping Weight | 0.65 |
| Units per Box | 20 |
| UPC | 816874020095 |
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