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What type of cleaning media should I use for cleaning 223.
Corn cob or walnut.
It really depends IMO on what degree of brightness you want to achieve.
I've had the best luck "overall" using walnut first, then resizing and decapping, followed by cobb removing the lube, and putting a real nice shine on the cases.
If you happen to use the Lyman walnut, it contains quite a bit of jewelers rouge, and I personally wouldn't go straight to the resizing step without a tumble in cobb to get rid of the rouge residue, as I wouldn't want to risk damaging my dies.
I personally don't use the Lyman walnut, as I don't want to add the extra step of getting rid of the rouge residue. I have found walnut will get rid of baked on carbon that the cobb couldn't remove, which is why I choose to use it as my first step.
If you're not interested in "bright and shiny", you can just use walnut before and after resizing, and decapping. Hope this helps.
Hangtime.