Dave and Dutch:
i'm a dedicated user of Goex Pinnacle powder. Pinnacle is still available from Powder, Inc.
http://www.powderinc.com/cgi-bin/bps...R_ID=964381342
BlackMag3 will never be made again unless some other company does it. BlackMag lost its license to manufacture powder after the wreck that killed two workers at their plant.
On the range before breaking the rifle down, open the hammer, flintlock, or inline breech. Then I spray a LARGE amount of Simple Green into the muzzle of the barrel. I let this flow down through and out the breech plug, nipple, flash hole... I do this to start the cleaning process, but also to keep that fouling soft. Then I saturate a patch and swab the bore a couple times.
Works for me. Before leaving the range i either spray Windex with vinegar into the bore or use a saturated patch. Makes cleanup at home much easier.