I used to get that too but I attributed my issue with using Nu-Finish polishing compound in the media. I always ran the tumbler for 10-12 minutes after adding about a capful thinned with paint thinner. Before adding brass I always ran my fingers through the media looking for clumps but would never find any, but sure enough I'd be left with media stuck to the inside of cases afterwards. I put up with it back when I only reloaded straight walled handgun cases and could wipe them out easily but once I started reloading rifle cartridges I wasn't willing to take the chance with a bunch of media taking up case volume so I bought the frankford wet tumbler and haven't looked back!
Yeah I could have just stopped adding the polishing compound and probably solved the issue but I was also looking for an excuse to upgrade to wet tumbling!
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