Yep, just finished tumbling some .44 Magnum handloads. These were a bit gunked up with excess lube so I tumbled them in corn cob media for about 1 1/2 hrs. This is a much debated topic. Some say don't tumble loaded ammo, you'll change the burn characteristics of the powder and blow yerself up and the other side says go ahead, no problems (many cite military handling of ammo; transporting in planes, trains, trucks, mules and jostling/vibrations are equal to tumbling). I'm in the "go ahead and tumble" camp...