If your looking for aggressive action try the ceramic media, Use a coarse grit and check your batch frequently to see your progress and keep track of the time and quantity put in each bactch. but it might cause more work on the final finish on the lugs. In general, I run batches between 2-6+ hrs but I use a rotary tumbler. Vibratory tumblers work faster and even more so submersed in a liquid.