The Hornady Superformance SST .300 Win Mag 180-Grain Rifle Ammunition is a high-performance centerfire ammo. The 180-grain SST bullets have a polymer tip and a boat-tail design for improved aerodynamics and expansion. The Superformance propellant boosts the muzzle velocity to 3,130 fps and the muzzle energy to 3,917 ft-lb., making this ammo ideal for hunting big game at long ranges. The ammunition comes in a 20-round box and is compatible with .300 Win Mag rifles.