while loading for a new double action revolver with lead bullets i noticed the bluing had worn off the front outside cornor of every chamber and slightly down the side.there was some smoke with some loads, used two powders 680 and rel 7 .some bullets had no crimp grove so just crimped beyond the wax.they did have a gaschk.would a tight cyclinder gap have anything to do with it .003 what is the most likely problem or do i need to give more info. thanks