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Underwood's 155 grain XTP load brings real stopping power to the 10mm platform. Each cartridge pairs a Hornady XTP jacketed hollow point with a carefully formulated powder charge that reaches 1500 fps and 775 ft-lbs of energy, putting this load at the top end of 10mm performance. The combination of velocity and expansion makes it genuinely useful if you're counting on your 10mm for defense or carrying it into the field for medium game.
The 155 grain bullet weight is the sweet spot for this caliber. It's light enough to push hard and fast but heavy enough to hold up on penetration. Real-world shooters report consistent reliability in compact and full-size 10mm pistols, with many noting that velocity out of shorter barrels (like a Glock 29's 3.8-inch barrel) stays well above 1400 fps. That sustained velocity is what keeps the XTP expanding reliably, especially compared to heavier loads that run slower.
The XTP bullet design gives you controlled expansion through progressive jacket tapering and a swaged lead core that sits inside an exceptionally concentric gilding metal jacket. This isn't just marketing talk; the engineering means the bullet expands uniformly across a wide velocity range and rarely fragments. Underwood loads these into nickel-plated brass cases that feed smooth, resist corrosion better than standard brass, and stay cleaner during storage. The boxer primer and reloadable design mean you can run these cartridges more than once if you reload.
Flash-suppressed powder is built in, which matters if you're ever shooting in low light or indoors. Your night vision won't take the hit from a massive muzzle flash, and you'll be able to follow up accurately. The nickel plating on the cases also means they won't tarnish if they sit in a holster or pack near leather or moisture for extended periods. All told, this is ammunition built for people who want their 10mm to actually perform like a 10mm.
The 155 grain reaches true 10mm velocities and maintains reliable expansion even from shorter barrels where heavier loads might slow down. It produces higher muzzle energy than some 180 and 200 grain loads, making it a solid choice if you want velocity-driven terminal performance without excessive recoil. The tradeoff is that penetration may be lighter than heavier bullets, which some prefer for urban defense scenarios.
Yes. These cartridges come with boxer primers and nickel-plated brass, both designed for reloading. The nickel plating actually resists cracking and embrittlement better than standard brass in high-pressure loads. Just follow proper reloading practices and keep the cases clean between uses.
Most users report reliable feeding and extraction in popular compact models like the Glock 29 and M&P Compact. The nickel-plated cases feed smoothly through various firearm actions, but always test your specific gun with at least one box before relying on any ammunition for defense.
If you're ever in a low-light situation, muzzle flash can ruin your night vision and throw off follow-up shots. Flash-suppressed powder minimizes that effect so you can actually see your sights. It's a practical feature whether you're training indoors, dealing with home defense, or hunting at dawn and dusk.
| UPC | 816874020286 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 232 |
| Caliber/Gauge | 10mm |
| Case Material | Nickel-Plated Brass |
| Grains | 155 gr |
| Length | 3.1500 |
| Shipping Weight | 0.76 |
| Units per Box | 20 |
| Cost per Round | 1.30 |
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