Carlson's Coyote Choke Tubes are for use with Hevi-Shot, Bismuth or lead, this high performance choke tube has been specifically designed for the coyote hunter to deliver devastating downrange patterns upwards of 70 yards when shooting larger shot sizes. Produces very dense patterns when utilizing T and #4 Buckshot loads. Great for waterfowl and predator hunting. *NOTE- Not for use with steel shot.