Originally Posted by Jingles
I don't do it often, but when it gets really bad I will remove the cylinder and chuck up a proper bronze bore brush in a cordless drill, dip it in Hoppes or Ballistol, and slowly work it back and forth in each chamber while I hold the cylinder in my hand. Works great.
I clean all my revolver chambers with a cordless drill and an.40 cal brush in the rod chucked into the drill. Gets them mirror bright in about 5 seconds each chamber hole. Follow up with a few solvent soaked patches and they come out black and then one wet patch comes out perfectly clean. Followed by a dry patch.
Don't do this for the barrel, of course. But a spinning brush on low to a smooth chamber hole isn't gonna hurt anything. Been doing it for 20 years.