Without wanting to change the subject,
Yesterday afternoon I put a bunch of Magnum Rifle Casings into our RCBS Vibrating Tumbler containing dry Walnut Media to tumble for 2.5 Hours. Then I got distracted and only this morning I remembered and turned the Tumbler off which worked flawlessly for over 15 Hours and Motor not warm, great.
The real surprise came that the Casings where actually even nicer and shinier (but only on the exterior surface - but not the Primer pockets) then SS wet tumbled Casings which where also shiny clean on the interior surface including Primer pockets.
Just saying, for those interested.
Cheers