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.