I haven't used the Petsmart or Walmart walnut yet (they always seem to be out of stock), but I do use the Lyman "TufNut" media. Its basically walnut shell impregnated with jewellers rouge. I tumble my cases for about 1.5 - 2 hrs and they come out looking like new. As the media starts breaking down and producing more dust, I will cut up a dryer sheet into strips and throw it in with the brass. This seems to keep the dust down a bit. I think I pay about $12 for a 6lb jug, so it is more expensive then bulk walnut, but the stuff lasts a long time, and I think it cleans faster then straight cob or cob mixed with case polish. YMMV.
EDIT: I tumble before I decap, I tried the other way around...ONCE. Picking cob out of flash holes gets old quickly.
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