I bought some junk and in it is a 50 cal barrel, rifling looks good but the flats are really rough most of the way down. What aggressive advice do I here for dealing with this before I shoot it. I am willing to try anything. I was wondering how to deal with this and still keep the flats flat? Maybe start a slug, pull it back out and force grit on the flats of the boolit? I figured I can't go wrong looking for expierenced advice. thanks, nekshot