Underwood Ammo Xtreme Defense Platinum Features Underwood Ammo Xtreme Defense Platinum is loaded with a 68 grain solid monolithic copper bullet that leaves the muzzle at 1300 feet per second generating 255 ft lbs of muzzle energy from a .380 ACP cartridge. Rather than relying on expansion the bullet uses an optimized nose flute geometry to carve a permanent wound channel that Underwood states is over 100 percent larger in volume than that of a typical expanding hollow point. Because the bullet is solid copper rather than a jacketed design barriers such as wallboard sheet metal and automotive glass have no meaningful effect on terminal performance a real advantage for a defensive round that may need to perform reliably through unpredictable obstacles. The round is rated supersonic and is safe to use through a suppressor broadening how the ammunition can be deployed. The cartridge cases are nickel-plated brass a finish that improves feeding across different pistol actions while offering better corrosion resistance than traditional uncoated brass during long-term storage. Nickel plating also resists tarnishing when the cases come into contact with leather moisture or other metals keeping a carry load looking and functioning like new in a holster or magazine for extended periods. With a sectional density around 0.077 and a ballistic coefficient of 0.087 the load is tuned specifically for penetration rather than flat trajectory matching its intended role as a close-range defensive round. Underwood Ammo Xtreme Defense Platinum .380 ACP ships 20 rounds to a box and is available for sale at GrabAGun for concealed carry shooters who want maximum penetration from a compact defensive pistol. Underwood Ammo Xtreme Defense Platinum Specifications Manufacturer: Underwood Ammo Model: Xtreme Defense Platinum Caliber: .380 ACP Rounds Per Box: 20 Bullet Weight: 68 gr Bullet Type: Solid Monolithic Muzzle Velocity: 1300 fps Muzzle Energy: 255 ft lbs Casing Material: Nickel-Plated Brass Sectional Density: 0.08 Ballistic Coefficient: 0.09 Application: Personal Defense Rating: Supersonic Available At: GrabAGun