Newbie question. Just getting into BP revolvers and I have aquired some supplies , powder measure, caps, BP, and various other items. What the heck is bore butter? "I use bore butter for this and that", "Put bore butter on the cylinder", "I have even used Bore Butter as a preservative in the barrel" I know you can buy Bore Butter but what is it made from, crisco/beeswax/lanoline etc. Anyone know?