Accepting that a black powder lube formula shouldn't have mineral oil or petroleum products, how do synthetic products, like synthetic grease, figure into it? It doesn't come from the ground. I got a big batch of very high quality synthetic grease for free, and have been using it 5 parts to 5 parts beeswax to 3 parts lanolin (by weight) and it seems to work fine with BP, but is very messy. (I do get a crunchy feel in the last 2 inches of barrel when wiping between shots). I next want to try adding some Murphys Oil soap to harden it up. Anyone else using synthetic in their lube?