No matter which Winchester ammunition you choose, when you load up with Winchester, you're getting precision technology, the highest quality components, optimum reliability and superior performance. Super-X ammunition is hard-hitting and reliable. From deer to upland birds, there is a Super-X product for almost every quarry. First introduced in 1922, Super-X ammunition delivers better and more dependable knock-down power. Made using precise manufacturing processes and high quality components, this ammunition has become the ammunition to rely and depend on for whatever your need.Available in many different calibers with several different bullet types, Winchester's Super-X ammunition is their most versatile ammunition line. Count on the name that has been trusted for many decades.