Wingmaster HD? Hunting Loads - Tungston - Bronze - Iron Shot? HD = Heavy Density (12.0 g/cc)? Proprietary composite of Tungsten-Bronze-Iron? Round consistent pellets: Travel straighter and longerImproves long-range lethality. Tighter patterns. More even pellet distribution? Uniform pellet density ? 12.0 g/cc density for optimal combination of density and pellet count? Softer pellets are easier on your barrel and more responsive to chokes ? Better patterns at long and short ranges ? Approved for waterfowl hunting by the USF&W and Canada? Responds to chokes; more lethal than lead