George,
The brake hone really doesn't remove metal very quickly, yes it works well on brake cylinders because they're typically cast iron but it really doesn't remove metal very quickly from steel gun barrels. I wish a brake hone was more efficient, the first time I tried this method it was on an extremely pitted Crescent hammer gun. I honed and honed and honed and never did get all the pitting out. I've found it's mainly good for just very light pitting. I've also used it useful for polishing chambers to help ease shell removal. Between using a brake hone and a bore brush wrapped in steel wool and dipped in rubbing compound you can make a chamber really slippery! It's cool to be able to just turn the gun barrels upside down and have the shells drop out.
Steve
