Underwood Ammo XTP Features Underwood Ammo XTP .38 Super +P is loaded with Hornady s eXtreme Terminal Performance bullet a design engineered for deep terminal penetration paired with controlled reliable expansion. At 124 grains and a muzzle velocity of 1350 feet per second the round generates 502 ft lbs of muzzle energy giving it significant stopping power for a semi-automatic pistol cartridge. A sectional density of roughly 0.14 and a ballistic coefficient of 0.165 reflect a bullet built to retain energy and penetrate rather than simply fragment on impact. The round is rated supersonic and is safe to fire through a suppressor giving shooters flexibility in how the ammunition is deployed. The cartridge cases are nickel-plated brass which improves feeding across different pistol actions and resists corrosion and tarnishing far better than traditional brass during extended storage in a magazine or spare mag pouch. Underwood also loads this round with flash-suppressed powder a detail that matters for a self-defense cartridge since it helps preserve the shooter s night vision if the firearm has to be fired in low light conditions. Underwood field tests its ammunition in popular real-world firearms so that reliability holds up outside the controlled environment of a lab. Underwood Ammo XTP .38 Super +P ships 20 rounds to a box and is available for sale at GrabAGun for shooters who want a proven Hornady XTP bullet behind their concealed carry pistol. Underwood Ammo XTP Specifications Manufacturer: Underwood Ammo Model: XTP Caliber: .38 Super Rounds Per Box: 20 Bullet Weight: 124 gr Bullet Type: Jacketed Hollow Point Muzzle Velocity: 1350 fps Muzzle Energy: 502 ft lbs Casing Material: Nickel-Plated Brass Sectional Density: 0.14 Ballistic Coefficient: 0.17 Rating: +P Application: Personal Defense Available At: GrabAGun