The Hevi-Shot™ handloader needs to use wad columns or shotcups specifically made for loading and shooting Hevi-Shot™. The TPS (Tungsten Propulsion System) shotcup is specifically designed for the rigors of Hevi-Shot™. The ultra-tough and specialized TPS design assists to protect the barrel from damaging pellets while the specific qualities of custom resins help to mediate the ricocheting nature of the tungsten alloys.