Recently I've paid more attention to prepping my .223 brass and uniform the primer pocket as well as deburr the flash hole. After doing this I tap each round on a flat surface until no more brass shavings come out. Then after about 800 cases I put them in a tumbler with corncob and the complete bowl of the tumbler is covered in brass shavings after a few hours. I still think there is more brass sticking inside the cases and don't want to pepper my barrels with this stuff after firing. I have a Thumlers Tumbler on the way to use with water and stainless media hoping that will really scrub all the stuff out. How have you guys dealt with this issue?