Underwood Ammo Ua 648 10Mm 140Gr Xtreme Penetrator 20/10

The Underwood Ammo 10mm 140gr Xtreme Penetrator is a solid copper, lead-free handgun round built for serious shooters who need reliable performance in self-defense and hunting scenarios. Loaded to 1500 feet per second with 700 ft-lbs of muzzle energy, this cartridge delivers the speed and stopping power 10mm shooters expect, while the copper construction ensures deep penetration and consistent expansion on target. Whether you're running a 10mm pistol for personal protection or hunting applications, this round offers the ballistic certainty of a proven, purpose-built load.

The nickel-plated brass cases are easy to reload and resist corrosion—a practical detail if you're a hand-loader or just want ammo that performs reliably in varied conditions. At 0.125 sectional density, the 140gr Xtreme Penetrator is engineered to cut through barriers and maintain velocity, making it an excellent choice for defensive scenarios where penetration matters. The round travels supersonic throughout its flight path, a characteristic that appeals to shooters who understand the ballistic advantages of velocity and sound.

Underwood's reputation for high-quality, hard-hitting ammunition is well-earned, and this load is no exception. Each box contains 20 rounds of factory-loaded ammunition ready to shoot. The suppressor-safe designation means you can run this round through a can without worry—a practical benefit for shooters with noise concerns at the range or in the field.

Key Features

• 140-grain solid copper bullet—lead-free and designed for deep penetration
• 1500 fps muzzle velocity with 700 ft-lbs of energy
• Nickel-plated brass cases resist corrosion and are reloadable
• Supersonic performance across the entire flight path
• Suppressor-safe for use with sound-reducing devices
• Proven for both self-defense and hunting applications
• 20 rounds per box

Specifications

Frequently Asked Questions

Is this ammo safe to use in a suppressed 10mm?

Yes. The Xtreme Penetrator round is rated safe for use with suppressors, making it a solid choice if you run a suppressed 10mm platform.

What is this round designed for—hunting or self-defense?

Both. Underwood engineered this load as a proven round for hunting applications and as an effective choice for self-defense scenarios. The copper bullet and high sectional density support deep, reliable penetration in either use case.

Can I reload the brass cases?

Yes. The nickel-plated brass cases are reloadable, so you can recycle them if you hand-load ammunition.

How much ammo is in a box?

Each box contains 20 loaded rounds, ready to shoot.