The big 45 and any spray lubricant works on leaded barrels also. Wouldn't have believed it but it's amazing! Watched a local gunshop owner spray some "generic pb blaster cheapo wd 40 sold by the gallon" out of a febreeze bottle into a ruger super blackhawk barrel, wait about a minute then wrap some of the big 45 strands around a bronze brush and start scrubbing. Lead flakes where literally splashing out of the barrel in about 5 quick strokes. After about a minute bore was clean and shiny. Ended up buying a couple of the big 45 pads and the blackhawk once he was done.