I picked up an H&R Buffalo Classic. The chamber has some significant corrosion. It initially wouldn't chamber a round due to the corrosion. I used kroil and JB bore compound and lapped the chamber with a jag and also chucked a brass bore brush in my drill and have it cleaned up to where it will now chamber. However after firing the brass is showing the imprint of the pitting, its indented where the corrosion is, showing I still don"t have it removed. Could this be fixed by running a chamber reamer in the chamber? I know bores are relined, is that also an option? Can a chamber be enlarged and lined?