Winchester Super-X 22 Long Rifle Ammo review offers the following information; Clean-burning powder and precision-formed cases allow for reliable functionality in a multitude of .22 LR firearms. In 1873, less than a decade after the Civil War and when Westward expansion was in full gallop, Winchester introduced the first successful centerfire cartridges. Winchester has set the world standard in superior ammunition performance and innovation for more than a century. To millions of hunters and shooters worldwide, the name “Winchester” means quality and performance. No matter the sport, game or protection, you can always depend on Winchester Ammunition to perform as promised.