I would do it if I could maintain the chamber thickness needed for the 7.62X39. When I do them, I don't count on the stub portion of the barrel having any strength for the chamber, just the barrel that I put in it. Generally I think if it can be chambered safely in a Thompson Contender then it is OK in the H&R as long as you maintain the chamber thicknes used on a TC. Has worked for me. Larry