Known for their high velocity 10mm ammunition, all Double Tap ammunition is loaded for high performance through any firearm. This particular DoubleTap load is seated with the Barnes Triple Shock X Bullet. These revolutionary bullets from Barnes are made of 100% copper and contain no lead, making them safe for the environment. When the bullet expands, four razor-sharp cutting petals are created, allowing the bullet to penetrate farther through tough bone and tissue. These bullets usually retain 100% of their original weight, making them a superb choice for hunting. . This ammunition is new-production, non-corrosive in boxer-primed, reloadable brass cases.