Underwood Ammo 155Underwood Ammo 155 Xtreme Penetrator 9mmLuger 115gr Solid Monolithic 20 Per Box/10 Case

Underwood Ammo 155 Xtreme Penetrator 9mm Luger ammunition combines serious stopping power with lead-free, environmentally responsible design. Loaded with Lehigh Defense's solid copper Xtreme Penetrator bullets, these 115-grain rounds are engineered for deep, consistent penetration and barrier performance without expansion or deflection. The monolithic copper construction and precision CNC machining deliver reliable feeding and repeatable performance from semi-automatic and revolver platforms alike.

The Xtreme Penetrator's distinctive blunt nose geometry creates initial energy transfer while driving straight and deep through intermediate barriers—leather, denim, heavy clothing, vehicle glass—that would stop or deflect conventional expanding rounds. The solid copper design means no lead exposure during or after shooting, making these rounds a smart choice for range time and carry scenarios where environmental responsibility matters alongside performance.

This is 9mm ammo built for shooters who demand penetration over expansion, whether you're training for defensive scenarios, hunting small game, or simply prefer the ballistic predictability and barrier-resistant properties of a monolithic solid. Each box contains 20 rounds, and this listing is for a full 10-box case.

Key Features

• Solid copper, lead-free construction—no environmental or indoor range exposure hazards
• Lehigh Defense Xtreme Penetrator bullet design maximizes depth of penetration and barrier resistance
• Precision CNC-machined nose for reliable magazine feeding and consistent ballistics
• Blunt nose geometry for straight, deep wound channel and energy transfer
• No deformation or deflection—punches through barriers that stop expanding rounds
• 20 rounds per box, 10 boxes per case

Specifications

Frequently Asked Questions

Will Xtreme Penetrator ammo feed reliably in my 9mm pistol or revolver?

Yes. The blunt nose design is specifically engineered for reliable feeding in semi-automatic magazines and revolvers. The precision CNC machining ensures consistent dimensions round to round.

Is this ammo suitable for defensive use or barrier-heavy scenarios?

These rounds are designed for deep penetration and barrier resistance. The solid copper construction will not deform or deflect when passing through intermediate barriers like clothing, denim, or glass, making them a practical choice for defensive applications where barrier performance matters.

Are these rounds lead-free?

Yes. Underwood Ammo 155 Xtreme Penetrator ammunition is manufactured with solid copper bullets, containing no lead. This makes them safe for indoor ranges and environmentally responsible for outdoor shooting.

What's the difference between Xtreme Penetrator and conventional expanding 9mm rounds?

Xtreme Penetrator rounds prioritize depth of penetration and barrier performance. Rather than expanding on impact, the solid copper design maintains its shape while driving straight and deep, creating a narrow but very deep wound channel. This makes them effective against intermediate barriers and in scenarios where consistent penetration is more important than wound diameter.