I've so far used the Wurth chain wax on 45 Colt in my Trapper and on 380 Rook. Total success in both cartridges. I'm currently shooting as cast, spary lubed bullets in my 45 Colt Trapper with accuracy as good as with lubri-sized bullets and no leading. I will get around to trying this with cast bullets in my 375 X 2½ as I promised but life keeps getting in the way.