Sierra 7mm 150gr Spitzer Boat Tail 100 PACKGameKing. For rifles chambered in 7mm cartridges, this bullet has the heavy, double tapered Sierra jacket for hunting. The 150 grain #1913 Spitzer Boat Tail bullet is a little heavier and thus provides a high ballistic coefficient compared to the 140 grain bullet. It is an excellent choice as a lighter bullet in any of the 7mm magnum cartridges for use at medium to long ranges. Both bullets are superbly accurate and provide excellent expansion with