Barnes Triple-Shock X Bullets 284 Caliber, 7mm (284 Diameter) 140 Grain Hollow Point Boat Tail Lead-Free (50pk)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"