In rifles, this 100 grain #1560 Spitzer Boat Tail bullet with a heavy, double-tapered jacket ensures adequate penetration with reliable expansion on medium game. It is the boat tail counterpart to the flatbase #1540 Pro-Hunter bullet, but when ranges exceed 300 yards, the #1560 bullet is the choice for best downrange performance. This bullet is exceptionally accurate, and it may be used in 6mm cartridges, such as the 243 Winchester, 6mm Remington and magnums. It also is a very fine bullet for larger varmints at long ranges. Sierra 6mm (1560) 100gr GameKing Spitzer BT (100pk) Heads