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I polish before decapping to clean the case before it goes to the resizing die.
The second tumbling cleans the primer pocket and finishes the case back to shiney. This cleans the primer pocket as well. I put the cases in the can, then add walnut until the can is about 2/3 full. You can hear the cases falling against the inside of the can. It's quite dynamic. .45 Colt cases with carbon on the outside from blowby clean right up in an hour or so. It's an industrial tumbler that I spotted in a salvage yard, so it isn't a toy. When I saw it the lights came on. I pour the can contents through an oversized cat box scoop, bounce them into an empty can,
one more trip through the scoop, and they're done. Walnut stuck in flash holes is an odd occurence, and on examination, the primer pockets are factory clean. The brand of walnut I use is Kaytee pet bird litter. It's small enough to go in the pocket, but not the flash hole.
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