Bovice, I thought that, too, until I took them apart and noticed the build up of brass and copper shavings, dust, case lube, etc. If you were to take them apart you will see what I mean.
Yep. I cleaned out my 9Mm expander die a couple of days ago. Plenty of brass "dust" in there. The plug was real clean, but the dies inner walls had buildup.
I'd probably blast it with some gun scrubber a brass bristle brush and then lightly CLP. I've put stuff in the tumbler with threads and it's not a good idea.
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