Just wanted to post a FYI
Took my Mosin Nagant to Bills in Circle Pines. I've never had them give me any grief about the rounds and they know what I'm shooting (almost all 7.62x54 is steel). I've taken it to both Bills at least half a dozen times without problems.
After a shot a man at the lane next to me came over and said he got hit by something when the nagant fired and he had a small mark on his arm. He thought it was brass at first but I told him it was a bolt action rifle and that the brass doesn't shoot out. We looked around on the floor for a while and then found a steel core on the ground. I checked the target and the only shot was in the center of the paper which was lined up on the cardboard hanger properly for bench shooting.
I talked to the range employee about it and he was pretty clueless, said it might have been a one in a million chance that the bullet hit something just perfectly so that it bounced back, he said he sees nagants there all the time without issue (seems like every time I go there's another one as well).
I think I'll leave the mosin at home from now on unless I'm going to an outdoor range. I also don't think I'd feel comfortable at the range with someone else firing one.