Federal Wing-Shok Magnum loads feature extra hard copper plated lead shot for tighter patterns, less feather draw and maximum penetration. These magnum loads featured a buffered shot. These heavier payloads make them move faster than a typical shotshell load. In order to create this long range lethal pattern, Federal uses a buffer. Buffered shells feature padding around the lead pellets. These buffers protect and support the shot when fired reducing deformation of the pellets, which result in tighter patterns. If you are a serious upland bird hunter, there is no better ammunition then Federal Premium Wing-Shok Magnum.