I put some .40 S&W in my tumbler with used "regular" corn cob. The brass ended up shiny on the bottom ends, but the mouths were still a bit dull. Yes, I had over-filled the tumbler a bit (437 pieces) and, as stated, the corn cob was well used. So, I emptied the bowl, replaced the media with Lyman Green Corncob (which I had never used before), and put back only half of the brass. After two hours of running.....the brass was universally DULL.
What's the story here?
What's the story here?