c: What sort of media are you using? I use plain corn cob and get no dust or residue at all. You should be able to take fired brass straight from the range, clean it for a couple hours in your vibrating tumbler, then move on to sizing without any intermediate steps. After sizing, you should "tumble" the brass again for about 2 hours to remove the case lube. Personally, I don't care whether the finished brass is shiny or not, so long as its completely clean on the outside. I don't expect the inside of the cases to come clean, therefore, I lube the inside of rifle case necks with dry graphite rather than anything sticky. Additives for the media like jeweler's rouge is NFG as it gets inside the cases and stays there. Corn cob granules will occasionally stick in the primer flash holes, but you can poke them out with a paper clip later when you are getting ready to prime a batch of cases. good luck - CW