I just started to set up for reloading.
I tumbled about 100 rounds of 223. I used the Lyman Tufstuf walnut media. Outsides are great but looking into the mouths of the shells, I see a fine layer of media colored dust inside the neck. Is this normal? Does the entire inside of the casing need to be swabbed out? Is there another product that does not leave this dusty layer inside?

Any information would be helpful.