I have been doing some research on the use of S.S. tumbling media for brass cartridge cases.All that I have seen and read about this stuff it appears to be the "cats meow" in particular with cleaning primer pockets and the inside of the cases.It costs about about the same as the ceramic media but uses dish soap and "Lemishine" available at Wal Mart.
The Thumlers Tumbler appears to the best machine for the actual tumbling with water.It will do all case sizes without the hang ups associated with the wrong size ceramic media.Ceramic media does not do a great job of cleaning primer pockets.
I have ordered 5lbs. of the S.S. media and will give report of it's performance,would like to hear from others who have used it.