If the media is true stainless, a magnet will have no effect.Well, I ran the brass for 1 hour and I am very happy with the results.
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Some lessons learned:
1. Can only run 1/2 the contents of a 5 gallon bucket, still a pretty good quantity compared to my old vibratory tumbler.
2. The post cleanup is a lot more labor than I thought, but it was nice as I did not have to deal with any dust. Rinsing till all the suds are gone and separating the pins from the brass took 3 different containers along with a media separator.
3. Those stainless pins go everywhere, I need to figure a way to separate them with a lot less mess. Maybe throw in some magnets the last 5 minutes of tumbling or acquire some bigger media or maybe not use them at all.