Itcan beused asa breech plug grease,to helpsoften powder residue, as a lubricant on externalmoving parts and as a protectant on surfaces that are exposed to powder fouling during shooting.
It also helps to dissolve & removeanyresidual traces of powder fouling leftin the boreand rifling grooves after cleaning. Swabit in, wait awhile andswab it out, then inspect the clean patch to seeif any black powdertracesare present that were lifted out.