I used to have this really pimping CED wet tumbling setup, with brass dryer and all, would work really well. Originally purchased to remove lead from the house.
Sold it all to go back to dry, and do not regret it at all.
Wet tumbling leaves your brass too dry, makes it sticky, so in these situations...
9mm in a Dillon 650, I would have to lube my brass (if not the brass makes running the machine really uncomfortable and tedious), and individually wiping it down is tedious so I would end up with gummed brass. Also required extra effort to work the 650, compared to dry tumble with tumbling media, which makes the brass slippery. With dry tumble, no lube required and machine requires even less effort.
308 in a single stage, I ran all sorts of neck sizing, neck tension, neck turning, bullet seating inconsistencies. After exchanging e-mails with Mystic Precision, and after have gone through all of my reload steps, he suggested trying a dry tumble. Solved everything instantly. Could of went the dry graphite route, but didn't feel like it.
Also, when coming out of tumbler, wet tumbled brass shines really hard, but loses it's luster very quickly. Dry tumbled brass will keep it's luster for a very long time.
I couldn't get the wet tumbler out the door fast enough, dry tumbling with media polish rocks.
And it is said, that media polish also reduces the lead dust in the air when opening the container.
Still tumble under a basement window, with a fan blowing air out the open window. Use gloses to separate brass and media, and wash my hands plenty...