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If you're running 10mm for woods defense or hunting larger game, this Underwood load puts real power downrange. The 220-grain hard cast flat nose bullet is built to penetrate without expanding, which means it drives straight through dense muscle and bone to reach vitals. That's what makes hard cast ammunition the go-to choice for bear country and any situation where you need reliable, deep-hitting performance.
Underwood upgraded from their previous Hi-Tek coating to a new Black Cherry polymer formula that's thermally stable and handles more heat and stress. The coating prevents direct lead-to-bore contact, virtually eliminating the barrel fouling that plagues uncoated hard cast rounds. This matters if you're shooting a lot, reload your brass, or just want to keep your barrel cleaner between cleanings. You also get less leading buildup, which means easier maintenance and more consistent accuracy over time.
Loaded in nickel-plated brass cases, these rounds deliver 1200 feet per second at the muzzle with 704 foot-pounds of energy. The nickel plating handles corrosion better than regular brass and feeds smoother through picky 10mm actions. Underwood uses flash-suppressed powder throughout their lineup, so your vision stays clear if you ever need to use this in low light conditions. The ammunition is new production, non-corrosive, boxer primed, and fully reloadable.
All 10mm firearms can safely run these rounds, whether you're shooting a Glock with polygonal rifling or any other modern 10mm platform. That heavy flat nose design was purpose-built for the backcountry, and with 20 rounds per box, you've got solid options for a hunting trip or defensive training.
Yes. Underwood specifically states that all 10mm firearms can safely function with this load, including Glocks with polygonal rifling. However, some shooters with heavily modified setups report occasional feeding quirks. Test fire a small amount to confirm compatibility with your specific gun before committing to larger purchases.
The Black Cherry polymer coating prevents lead from contacting the bore, which dramatically reduces barrel fouling compared to uncoated hard cast ammunition. It also provides wear and abrasion resistance, stays thermally stable, and reduces the smoke and airborne lead particulates you'd normally see. If you reload your brass or shoot frequently, this coating makes a real difference in barrel maintenance.
Hard cast ammunition is designed for penetration, not expansion, which means it can over-penetrate in urban environments. Most instructors recommend soft-point or hollow-point loads for personal defense against human threats. That said, this load is purpose-built for backcountry defense against large predators like bears, where deep penetration through bone and thick hide is exactly what you want.
Yes. These are boxer-primed nickel-plated brass cases that are fully reloadable. The nickel plating, processed with Underwood's Ducta-Bright 7a method, doesn't have the brittleness issues that older nickel-plated cases sometimes had, so you can reload them multiple times without concern.
| Caliber/Gauge | 10mm |
|---|---|
| Case Material | Nickel-Plated Brass |
| Cost per Round | 1.45 |
| Grains | 220 gr |
| Length | 3.1500 |
| Manufacturer | |
| Manufacturer Part Number | 242 |
| Shipping Weight | 0.92 |
| Units per Box | 20 |
| UPC | 816874020842 |
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