Pete,
There is a guy here in Michigan that is selling a ceramic media that works in a rotary tumbler. I have been using it for most of this year now with 223 Rem. and 308 Win. cases. It works well. A few things though, as I stated earlier you need a rotary tumbler. I have also found that if you dont clean your cases quickly ( 1 to 2 weeks) after firing the carbon does not come out as easy. Also dont use alot of the media. If you are getting cases clogged up with the media you are using way to much. I use 2 small handfulls of it and dont have many cases with media in them.
The kit consists of the ceramic media and a bottle of soap that you add 1 capfull to the tumbler. It does work very nicely. My process is to run the cases in a regular vibratory tumbler for an hour just to clean up the outside of the cases. Then I resize the cases and run them with the ceramic setup for about 4 to 6 hours. Then after I seperate the cases from the media and dry them, then I run them through the vibratoy tumbler for a few hours just to polish them up a bit. I know it sounds like a lot of work, but it really is not all that bad. The cases are clean inside and out including the primer pockets. You should see how dirty the water is when you dump it out after the ceramic media run. Here is his address, sorry I have forgotten his name. HTH
John Luitink
Shooter 2
9002 Norris Rd.
DeWitt, MI. 48820
517-669-9801