Hey all, my father in law gave me his Winchester single shot 20 guage. I was going to take it out for ducks today but I wasn't sure if I could shoot steel through it. It has a fixed improved modified choke in it, which doesn't bother me much... it says on the side of the barrel Winchester "Improved modified choke - Winchester proof steel". I have no idea how old this gun is.... but don't want to ruin it by shooting steel through it if it can't handle it. The chamber is 2.75 or 3 inch... which leads me to believe its ok for steel.... but I am second guessing myself. Al?? Or anyone else that knows guns?? What do you think?