i have lapped high power rifle barrels using the method Bronko describes. It works well.

The bore of my new Encore was very rough. It washard to clean properly and loaded very hard. Used red jeweler's rouge on a patch and jag. After about 15 minutes and five patches coated with jewelers rougethe barrel was much smoother.The barrel is much easier to load and clean.The gun also seemsto be more accurate.