http://www.thehighroad.org/showthrea...=498890&page=2
If you really want to know if tumbling loaded ammo causes problems, read the above thread from THR. Yeah, that's me over there too. Walkalong and I had some fun and proved that in those two pistols there wasn't any change in anything from the tumbling.
If it makes you nervous, and you think you
just know it will hurt your ammo/gun, then don't do it. Have fun wiping each case with a towel!