Underwood Ammo 641 380ACP+P 90GR XP 20/10

The Underwood Ammo .380 ACP +P 90-grain Xtreme Penetrator is a solid copper handgun round engineered for serious stopping power in a compact platform. Built in partnership with Lehigh Defense and manufactured using CNC machining, this ammunition combines deep penetration with controlled expansion—critical for defensive and hunting applications where barrier performance matters. The 90-grain weight and +P pressure rating deliver velocity and energy from even short-barreled .380 pistols, making this round a step above standard .380 ACP loads.

What sets the Xtreme Penetrator apart is its construction and geometry. The solid copper projectile eliminates lead entirely, making it safe for indoor ranges and environmentally responsible shooters. The distinctive blunt nose profile is designed to maximize hydrostatic shock and create a larger permanent wound cavity upon impact. Sharp cutting edges on the bullet are meant to slice through heavy clothing, intermediate barriers, and other obstacles that can degrade performance in real-world encounters. The nose geometry also supports reliable feeding from magazine to chamber—a practical consideration for any defensive round.

Each box contains 20 rounds, conveniently packaged for range work, practice drills, or keeping a duty load on hand. The combination of solid copper construction, deep-penetration bullet design, and +P velocity makes this a serious choice for shooters who refuse to compromise on performance in the .380 ACP category.

Key Features

• Solid copper, CNC-machined construction for consistency and environmental responsibility
• Blunt nose profile designed to maximize hydraulic velocity and permanent wound cavity
• Sharp cutting edges engineered to defeat barriers and tough materials
• .380 ACP +P pressure rating for enhanced velocity and energy
• 90-grain projectile optimized for .380 platforms
• Designed for reliable magazine-to-chamber feeding
• 20 rounds per box

Specifications

Caliber	.380 ACP +P
Bullet Weight	90 grains
Bullet Material	Solid copper
Rounds per Box	20
Manufacturer	Underwood Ammo (with Lehigh Defense)

Frequently Asked Questions

Is Underwood .380 ACP +P ammunition safe to shoot in my standard .380 pistol?

The +P designation indicates above-standard pressure. You should consult your firearm's manual or manufacturer to confirm it's rated for +P ammunition before use. Many modern .380 pistols are rated for +P, but some are not.

What makes solid copper ammunition better for indoor ranges?

Solid copper projectiles eliminate lead, which can create airborne particles in poorly ventilated spaces. This makes them a cleaner choice for indoor shooting ranges and practices where lead exposure is a concern.

How does the Xtreme Penetrator bullet design improve performance?

The solid copper construction, blunt nose geometry, and cutting edges are designed to work together: the shape maximizes hydrostatic energy transfer, the edges cut through barriers and clothing, and the solid construction allows deep, reliable penetration while creating a larger wound cavity than traditional hollow-point designs.

Will this round feed reliably in my .380 magazines?

The Xtreme Penetrator's nose profile was designed specifically to support reliable feeding from standard magazines. That said, ammunition feeding can be affected by magazine condition and firearm design—if you've had feeding issues with other ammunition, test a small quantity first.