I once tested several lubes for accuracy out to 50 yards. I tested Moosemilk, Olive Oil, Bore Butter, my home made lube, and spit. The two top shooters were Olive Oil and moosemilk. The test was done with black powder as Arcticap noted. It was in the fall. But an amazing thing was with spit, accuracy was still more then acceptable. And the fouling was not all that bad for loading the next round.