I load revolver brass almost exclusively. I only tumble when I think they need it. Simple wipe with paper towel before re-sizing and all is well. I don't touch the inside of the case. Same with primer pocket. Only touch when I think it's needed. I found out years ago that shiny brass doesn't shoot any better than dull brass
. Of course all 'scrounged' brass will get tumbled the first time to get any dirt off of them and for inspection.