I am working on a .50 cal. CVA rifle that has a neglected bore. Using Fluid Film and getting rust-stained patches - more work to do. Bore light shows good/serviceable rifling and what appears to be many small rust spots or scattered, generalized light pitting. I have a packet of Scotch-Brite green "heavy duty scour pads" and lots of 0000 steel wool. Suggestions on using these to improve the bore, please. TIA.