Nosler Ballistic Tip Varmint Bullets 243 Caliber and 6mm (243 Diameter) 70 Grain Spitzer Boat Tail (100pk)Varmints and predators beware! Nosler's ballistic Tip Varmint Bullets are designed forviolent expansion upon impact. The bullet is tipped with a polycarbonate tip which rapidly drives back forcing the thin jacket to expand and fragment. The heavy base prevents deformation during firing and the boat tail design increases the ballistic efficiency of the bullet. This is not loaded ammunition. Technical Information Caliber: 243, 6mm Bullet Diameter: 0.