Beef fat, hog fat, deer tallow, it all serves the same purpose. Keep the fouling soft so it blows out. PL-II uses a microcrystalline wax, Soy wax and shortning. It works, stays put till fired and coats the barrel and rids the barrel of fouling. That's about all a bullet lube can do. The rest is up to the bullet to haul enough lube to do the job.
We just finished shooting the Wi. State Champion SASS shoot (Fandango) and our whole camp was shooting BL bullets. No cleaning between days, no fouling problems and I even shot the last stage clean.
DD-MDA