tommeboy:
You have opened a can of worms! There are more "favorite lubes" than muzzle loader shooters. However, the purpose of lube when shooting REAL or Maxi bullets is to keep fouling soft for subsequent loads without wiping the bore and possibly to help seal the bore until the bullet upsets or obturates sufficiently to do the same thing.
I have used a 50/50 mix of bee's wax and store-bought (in the baking section) lard or Crisco for all my muzzle loading bullets (patched balls are a different matter) with excellent results. A little more wax in hot summer weather, a little less in cold weather. Works great, easy to make, doesn't go rancid, cleanup is a snap. As far as keeping the powder fouling soft, I have loaded and fired 50+ REAL bullets using this lube without having to wipe the bore once. Accuracy was as good on the last shot as the first. Works as well with BP Substitutes as it does with the real thing.