These revolutionary bullets from Barnes are made of 100% copper and contain no lead. 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. Barnes recommends initially seating bullets 0.050" off the lands. Best accuracy will be found from 0.030" to 0.070" depending on the rifle.