The unique FLITECONTROL wad in Prairie Storm Ammunition will deliver inconsistent patterns in ported chokes or when used with wad-stopping or stripping devices. This choke uses a special field-tested constriction and length to get the most from Federal Premium Prairie Storm Ammunition. Carlson's titanium-coated choke tube allows Federal's special FLITESTOPPER lead pellets and FLITECONTROL wad deliver devastating downrange patterns. This choke performs equally well with lead, copper, nickel, Hevi-Shot, and steel shot loads. Carlson's New Prairie Storm choke tube is a proven performer on pheasants and upland birds using all lead and steel shot loads over extended distances. PLEASE NOTE: The EARLY SEASON choke tube is a LM constriction and the LATE SEASON choke tube is an IM constriction. All sizes and speeds of Steel shot may be used in either choke tube.