Blackhorn 209 seems to leave a lot of loose soot in the barrel. In the past I've use a Hoppes solvent patch as the first patch to clean the barrel and this seems to spread the soot out all over the barrel and rifling. Then is takes a lot of patches to remove all of it. I now use a dry patch first to remove the majority of the soot and then use the Hoppes solvent patches until clean, then dry patch, and then an oil patch.