The Winchester Super-X Heavy Game line of ammunition is specifically designed to meet the needs of serious upland game hunters. These shells feature a heavy construction and are loaded with a uniquely blended propellant to ensure speedier, harder-hitting loads for unbeatable takedown in nearly any hunting situation. The Winchester Super-X Heavy Game line of ammunition is an excellent example of Winchester's commitment to quality backed by more than 140 years of experience. These heavy game loads feature a clean-burning powder and a one-piece plastic wad for reliable ignition and high velocity.