[CrustyFN]

I don't but have talked to a lot of people that do without problems. The ammo manufactures tumble the ammo after it's loaded and before it's boxed. I don't see how throwing around cases of WWB ammo that's packed loose could be any less dangerous than tumbling loaded ammo. Mainly in the tumbler the ammo is just rubbing against each other not crashing into each other. I only tumble pistol before it's loaded, I use carbide dies so there is nothing to clean off. Rifle ammo I tumble before and after sizing to clean the lube off. I am thinking of tumbling some after they are loaded to see how it works.
Rusty