What is the best size Walnut Media for Tumbling Brass cases? It was probably 10 years ago I bought 25 lbs at Western Ranch supply (pet bedding) but can't remember if there was a grit or grain identification to the media or not, I think it was just Crushed Walnut Shells in an open tub that you weighed however much you wanted. What should I be looking for in Crushed Walnut Shell Media or will any Crushed Walnut Shell media work to clean brass cases?. I have about 10 lbs of. Corn Cob Media but I use that to polish brass with, right now I'm down to my last 3lbs in the Vibrating Tub and want to get more before that gets used up. Thanks for any info on Walnut Media.