As long as we're on the subject of chemicals for the barrel, there was an article in the November 2009 American Rifleman on the subject of bore cleaning that mentions Wipe Out and Ultra Bore Coat. Wipe out is apparently not kind to wood or oil finished stocks, so use caution. I'm intrigued by the Ultra Bore Coat, as it's intended for black powder use. The article can be viewed at: http://www.americanrifleman.org/ArticlePage.aspx?id=1945&cid=3
I'm glad the 8mm trick worked so well!