Accu-choke tubes handle lead, steel and all other non-toxic loads. Each choke tube is marked with a shot patterning designation as a guide.For consistent pattern performance with a variety of loads, look for Accu-Choke choke tubes in a variety of gauges and constrictions for hunting and recreational shooting. Features: Also compatible with Smith and Wesson, Savage, and US Repeating Arms (Win-choke) and Browning Invector interchangeable choke models