I recently saw on TV a spot about breaking in a new handgun. It showed a different way that will make your barrels last much longer. You take and shoot once, clean gun and do this 5 times. Then shoot 5 rounds and clean gun do this for 6 times and you should have very little problems with buildup in your barrel. This was a S&W handgun show and a factory hand put on the demo. Seems like it will take a few hours of time to do this but the outcome would be of benefit.