After some quick Google-fu, I've come to learn that this is incorrect - due to compounds in the primers, tumbling dust DOES contain lead - more to be aware of, and I suppose more of a reason to look toward wet tumbling?I'm not worried so much about lead in the dust - you gotta figure that most of the time, unless you're shooting cast lead bullets that lead probably isn't much of a factor. However, the dust, which contains all manner of other things, probably isn't good for you.