Underwood Ammo Xtreme Penetrator Features The Underwood Ammo Xtreme Penetrator bullet is a solid copper lead free design engineered for reliable straight line penetration from smaller caliber pistols. At 90 grains and 1100 fps the load pushes 242 ft lbs of muzzle energy from a .380 ACP platform giving carriers meaningful stopping power despite the compact cartridge. The bullet has a sectional density of 0.10 and a ballistic coefficient of 0.12 factors that contribute to consistent penetration depth. This solid monolithic construction resists deformation on contact keeping the wound channel predictable across barriers. Nickel plated brass casings improve feeding reliability across compact pistol actions and resist corrosion during long term carry or storage. The plating simplifies cleanup during reloading and prevents tarnishing when the cases contact leather holsters moisture or other metals. Underwood confirms this load is safe to use in a suppressor an option some .380 ACP carriers rely on for reduced report. This combination of penetration and reliability makes the Xtreme Penetrator a strong self defense option for compact .380 ACP pistols. Underwood Ammo Xtreme Penetrator Specifications Manufacturer: Underwood Ammo Model: Xtreme Penetrator Caliber: .380 ACP Bullet Weight: 90 gr Bullet Type: Solid Monolithic Muzzle Velocity: 1100 fps Muzzle Energy: 242 ft lbs Casing Material: Brass Rounds Per Box: 20 Available At: GrabAGun