Underwood's .380 Auto 68gr Xtreme Defender fires a solid copper fluted bullet at 1,300 fps, producing 255 ft-lbs of muzzle energy. This is not a hollow point. The bullet is machined from a single piece of copper by Lehigh Defense with deep flutes cut into the nose. These flutes redirect tissue outward through fluid dynamics, creating a wound channel wider than the bullet itself without relying on expansion. The nickel-plated brass case handles feeding and corrosion resistance.

The biggest advantage of this design is that it cannot clog. Traditional hollow points can fill with clothing fibers, drywall, or other debris and fail to expand, essentially becoming an expensive FMJ. The Xtreme Defender's flutes are machined into solid copper. There is nothing to plug, nothing to collapse, nothing to fail. The wound mechanism works the same whether the bullet passes through bare gel, four layers of denim, or a leather jacket. This consistency is why the design has gained a following among concealed carriers who worry about real-world barrier performance.

This load fits shooters who want a different approach to .380 self-defense. At 68 grains, it is lighter than standard 90-95gr loads, which means noticeably less felt recoil in small pistols. The tradeoff is reduced momentum, so penetration depth depends more on velocity retention than bullet weight. The solid copper construction also makes it lead-free, which is a factor for shooters who practice at indoor ranges with lead restrictions. It feeds in any .380 pistol without the feeding issues that some JHP designs cause in finicky pocket guns.