Ballistol was, I believe, developed by the German military before WW I and was there to help them lose two big ones. Like others, I really like the stuff, having discovered it in my golden years. Shall try using it as patch lube, based upon this thread. I use other, seemingly more effective, combinations to clean black powder residue then thoroughly wipe down interior and exterior metal with Ballistol. And it does have the collateral advantage of keeping the wife out of my work room.