Underwood Ammo Xtreme Penetrator Platinum Features The Underwood Ammo Xtreme Penetrator Platinum round combines Underwood s trademark power with Lehigh Defense s Xtreme Penetrator bullet design which means the solid copper projectile is engineered specifically to maximize penetration depth. Its unique nose geometry increases hydraulic velocity creating high pressure spikes that result in a larger permanent wound column and more than twice the penetration of many expanding bullets. A blunt nose profile aids initial energy transfer while maintaining straight deep penetration and it is shaped to feed reliably through semi-automatic pistol magazines. Because the bullet is solid copper rather than a traditional lead core design it is entirely lead free which benefits both the environment and shooters concerned about lead exposure. Loaded to 1500 fps this 140 grain 10mm round generates 700 ft lbs of muzzle energy delivering serious stopping power in a self-defense or hunting context. The round is housed in new production non-corrosive boxer primed reloadable nickel-plated brass cases giving handloaders the option to reuse the brass after firing. This ammunition is rated safe for use in a suppressor making it a versatile choice for shooters running a suppressed 10mm platform. With a sectional density of 0.125 the Xtreme Penetrator Platinum is built for medium to large game hunting as well as serious personal protection applications. Underwood Ammo Xtreme Penetrator Platinum Specifications Manufacturer: Underwood Ammo Model: Xtreme Penetrator Platinum Caliber: 10mm Rounds Per Box: 20 Casing Material: Nickel-Plated Brass Muzzle Energy: 700 ft lbs Muzzle Velocity: 1500 fps Application: Medium-Large Game Bullet Weight: 140 gr Bullet Type: Solid Monolithic Rating: Supersonic Available At: GrabAGun