Sounds like some form of fire lapping, but I would question it as a method to "restore" a pitted bore. You may want to get rid of high spots and get the rust out of the pits, but at the same time you want to preserve what's left of the lands. With this method you can sure get rid of the high spots, but if you go on trying to remove pits you may end up with a bright, shiny bore that's oversized and won't shoot very well. Many pitted bores shoot surprisingly well, and I can't see any advantage in making them nice and shiny at the expense of accuracy. I have cleaned out many pitted barrels, but I just scrub them good with a good bore cleaner and leave it at that.
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