I quit formally breaking in hand lapped barrels several years ago. It is a waste of barrel life. Get a bronze bore brush and put a little 0000 steel wool and put it in your electric drill and clean the fluff left from chambering. Clean your barrel with JB or Iosso and it is broken in. I do have a borescope to verify this.
Tell me how shooting and cleaning will do a better job than the MFG. when he laps them.
