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The Xtreme Penetrator represents Underwood's partnership with Lehigh Defense to create solid copper ammunition designed for maximum terminal performance. At 1500 feet per second, each 140-grain round generates enough energy to cut through barriers and thick materials that would defeat conventional expanding bullets. The unique nose geometry creates hydraulic pressure spikes that generate wound channels exceeding what most hollow points can achieve.
The monolithic design means 100 percent weight retention through whatever the bullet encounters. Unlike hollow points that can clog with fabric or debris, this solid copper projectile maintains its structural integrity and penetration capability. The fluted nose design increases hydrostatic effect by manipulating fluid dynamics inside the target, creating multiple wound channels from a single impact. Real-world testing shows this loading cycles smoothly in modern 10mm pistols and carbines, with reliable magazine feeding thanks to the blunt nose profile.
Nickel-plated brass casings provide improved feeding reliability and corrosion resistance compared to standard brass. The ammunition is loaded with flash-suppressed powder so your vision won't be compromised if you need to use your firearm in low-light conditions. Each box contains 20 rounds, with standard cases holding 10 boxes. The lead-free solid copper construction makes these rounds environmentally friendly and suitable for areas with ammunition restrictions. These are reloadable rounds, and they're safe to use with suppressors.
The Xtreme Penetrator uses a solid monolithic copper bullet with a unique fluted nose design instead of a hollow cavity. Rather than relying on expansion, the flutes create hydraulic pressure spikes that generate multiple wound channels through fluid dynamics. This design maintains structural integrity through barriers and creates larger wound channels than traditional expanding bullets while ensuring consistent deep penetration.
Yes, the blunt nose profile and nickel-plated brass cases are specifically engineered for smooth feeding in modern 10mm semi-automatic firearms. Field testing confirms reliable function across popular pistols and carbines. The solid copper construction and polished finish contribute to consistent chambering and ejection.
The Xtreme Penetrator is designed for both applications. The deep penetration and multiple wound channels make it effective for medium to large game hunting, while the barrier-defeating capability and consistent performance make it suitable for personal protection. The lead-free, solid copper construction also works well in areas with ammunition restrictions.
Yes, these rounds use reloadable nickel-plated brass cases with boxer primers. The nickel plating actually provides benefits during the reloading process by reducing friction on the feed ramp and improving overall handling durability.
| Caliber/Gauge | 10mm |
|---|---|
| Case Material | Nickel-Plated Brass |
| Cost per Round | 2.15 |
| Grains | 140 gr |
| Length | 3.1500 |
| Manufacturer | |
| Manufacturer Part Number | 648 |
| Shipping Weight | 0.735 |
| Units per Box | 20 |
| UPC | 816874020071 |
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