I have one in 20 guage it has a screw on type of choke. I wouldn' recommend steel shot, the barrels of that time we not made for steel. Slugs I don't know, especially if it has a screw on type of choke. Buck shot yes, slugs I wouldn't suggest it. Shooting steel in an older gun will ring the barrel a couple of inches from the muzzle. I know because I have shot steel thru an older mossberg and it has developed a ring. While the barrel for my mossberg was cheap it did develop a ring. Only appears more cosmetic than real harm but its still there. Another thank is steel is best thru a modified choke.