I use half and half walnut and corn cob media. Then use a dryer sheet, tear it in half and put both pieces in. I only use 1/2 cap of nu-finish after about 5 or so loads. A little goes a long way. Put it in without any cases and let the tumbler run 5 to 10 mins to mix it in, otherwise you may get some inside the cases.
I have over 10,000 cases cleaned on the same media. I run the tumbler for 2 to 3 hours and it comes out great. Dispose of the used dryer sheets (which take care of all the dust) and throw in another load. I can put up to 350 9mm or 250 38s in at once no problem.