Both of your experience is similar to mine - but a question for both of you is how frequently do you replace the media in your tumbler?
Seems like the more it's used, the more it breaks down into dust. Also have noticed that pistol brass leads to faster break down of the media as compared to larger rifle brass. I've assumed that it's from greater surface area with the smaller cases?
My older Lyman tumbler is dusty no matter what I do, but covering the top with press and seal plastic wrap before putting the lid on takes care of it quite nicely.
And yes, some clever company needs to relabel lizard litter as vibratory media - it is far superior to anything else I have ever used.
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