Hevi-Shot Hevi-Steel 12Ga 3-1/2" shotgun ammunition was designed to get you maximum performance from an all steel waterfowl shell. Hevi-Steel still offers the Waterproof crimp hunters have come to expect from all Hevi-Shot products. Hevi-Steel 12Ga 3-1/2" shotgun ammunition uses custom blended powders designed for maximum speed and lethality. A newly designed custom wad cup ensures maximum pellets on target.