I don't have a clue as to what's in it, Brit- but if it work, it works.

For a rule of thumb:

:If the bullets lead only at the muzzle, there was not enough lube.

:If the bullets lead at the breech, the lube was too hard.

:If the bullets lube throughout the bore, the lube is not suitable as a lube - or the alloy was too soft, or bullets undersize and too hard to obturate.

:If using black powder for hunting loads where more than one shot will be fired without wiping, you should be able to fire a minimum of 5 shots and have ALL of the fouling wipe from the bore with a SINGLE DRY patch - that shows the lube was working properly for a BP lube.

:Look at the muzzle of the gun after shooting. There should be a thin lube ring outside the muzzle, on the crown to show lube worked all the way to the muzzle.

just some hints - hope they help.