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Message: <blockquote data-quote="Rustygun" data-source="post: 3923281" data-attributes="member: 4711">I use crushed walnut from harbor freight, a squirt of Nu-finish, or Lewis metal polish, and tumble 300-400 rounds of 9mm at a time.  All outdoor range pick up brass and some is pretty nasty.  I set a timer for 2 hours but usually after about 1 hour the brass is pretty darn clean.  This process works well for me. I have arrived at the conclusion that super shiny brass does not make my guns run better or me a better shooter.  Remembering that the goal here is to fill the inside with burnt carbon soot and quickly throw them on the ground.</blockquote>