Like the rest of the guys here, I donÂ’t see a problem with tumbling brass for a while, as long as you donÂ’t let them tumble for long periods of time. Long tumbling sessions (like starting the tumbler and leaving on vacation for 2 weeks and forgetting to turn it off before you leave) may thin the body/shoulder transition of some of your cases.
IÂ’m sure theyÂ’ll be bright though.
I tumble all my brass but I donÂ’t worry about bright and shiny. I worry about clean. If I get shiny brass thatÂ’s just a bonus.