Lead shot is illegal for all waterfowl hunting, including ducks, mergansers, geese and coots. Hunters may not hunt waterfowl while in possession of shot other than nontoxic shot approved by the U.S. Fish and Wildlife Service. The shot must be 0.2 inches - T size - or smaller. Only steel shot or shot made from bismuth-tin, tungsten-iron, tungsten-polymer, tungsten-matrix, tungsten-nickel-iron, tungsten-iron-nickel-tin, tungsten-tin-bismuth, tungsten-tin-iron, tungsten-iron-copper-nickel, or tungsten-bronze, are on the list of approved nontoxic shot.