zrifleman-I'm not too worried about the potential for salt, since I clean my black powder guns the same day I shoot them. Usually, I use Dawn and hot water or Murphy's mix. Until I can clean them, they're stored in corrosion inhibiting bags. Combined with the same day cleaning, that should prevent any problems.
Besides, I don't know the formulas for the commercial lubes, but they may very well contain tallow. The SPG that I've smelled sure wasn't very "vegan" smelling. T/C Bore Butter uses strong cover scents and dyes, no doubt to make their formula harder to figure out. They don't have petroleum based greases, and I doubt that the SPG aroma, or Bore Butter's cover scents are there because of the inoffensive smell of vegetable based lube.
cooper-Thanks for the offer, but I've got a couple of recipes in mind. I just wondered about the ingredients.
That's interesting about the kidney fat. Folks making soap and tallow candles prefer it, too.