I've heard many compliments on Goex Olde Eynsford black powder. A hundred years ago they found what patterns best and you might find a lighter load than 2oz will pattern better. The Fluid Film I mentioned earlier is a lanolin based and not result in black powder fouling like petroleum based products.
https://www.theruststore.com/Fluid-F...l-P179C67.aspx I wipe my bore out with rubbing alcohol prior to loading. When I start to get fouling on the range I will swab the bore with MAP (equal parts of murphy's oil soap, rubbing alcohol, and hydrogen peroxide) followed by rubbing alcohol. MAP will often do as good a job cleaning the barrels as soap and water.