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The Underwood 9mm Luger +P+ 115gr Xtreme Penetrator stands out because it swaps the traditional lead-core hollow point design for solid copper engineering. Built through a collaboration with Lehigh Defense, this load uses precision CNC-machined projectiles that don't rely on expansion to perform. Instead, the unique nose geometry forces hydraulic energy outward upon impact, creating a permanent wound cavity that rivals or exceeds typical expanding bullets while maintaining exceptional penetration depth.
This ammunition is lead-free throughout, making it environmentally responsible without sacrificing terminal performance. The monolithic copper construction allows the projectile to overcome barriers like clothing, drywall, and automotive glass without deformation or trajectory deflection. Cutting edges on the nose defeat barriers while the blunt profile ensures consistent magazine feeding in your pistol.
That progressive nose geometry creates high-pressure spikes through fluid transfer, generating penetration depths around 18 inches in ballistic gelatin testing while maintaining two to four times the permanent wound cavity compared to traditional flat or round-nose bullets. At 1300 fps from a standard barrel, this +P+ load delivers 432 foot-pounds of muzzle energy—enough velocity to ensure reliability from compact carry guns without sacrificing performance.
The nickel-plated brass cases provide superior corrosion resistance and smoother extraction compared to standard brass, while the boxer primers and reloadable construction appeal to handloaders looking to get more from their ammunition investment. Twenty rounds ship in each box, packaged for consistent, field-tested performance that works with the real firearms people actually carry. Underwood field tests all their ammunition through popular production pistols, not laboratory test beds.
The Xtreme Penetrator skips traditional expansion and instead uses solid copper construction with special nose geometry to create penetration and wound cavity through hydraulic energy transfer. This design performs predictably through barriers like clothing without losing effectiveness, which traditional hollow points sometimes struggle with. You get straight-line penetration around 18 inches plus a permanent wound cavity comparable to or larger than expanding bullets.
That depends on your specific firearm. Check your owner's manual to see if the manufacturer rates it for +P or +P+ ammunition. Most modern 9mm pistols rated for +P will handle +P+ loads, but older guns or those rated only for standard pressure shouldn't use this ammunition. When in doubt, contact Underwood or your firearm's manufacturer to confirm compatibility before you shoot it.
Yes, Underwood confirms this load is safe for use with suppressors. The ammunition is designed to be supersonic, traveling faster than the speed of sound, and won't cause suppressor damage. Just make sure your firearm itself is rated for both the +P+ pressure and suppressor use.
Solid copper monolithic bullets require precision CNC machining from solid bar stock, which is more labor-intensive than traditional bullet manufacturing. Copper costs roughly 30 percent more than lead, and the precision required to machine individual bullets drives the per-round cost higher than jacketed lead-core alternatives. Underwood manages competitive pricing through bulk Lehigh Defense purchases and efficient loading operations.
| Caliber/Gauge | 9mm |
|---|---|
| Case Material | Nickel-Plated Brass |
| Cost per Round | 1.75 |
| Grains | 115 gr |
| Length | 2.7000 |
| Manufacturer | |
| Manufacturer Part Number | 823 |
| Units per Box | 20 |
| UPC | 816874020217 |
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