Your dies will not be your friend if you don't clean that brass.
Now, for the OP: If you tumble in stainless media your pockets will be cleaned in the tumbling process. If you use regular media tumbling, I don't see why you would not take the 2 seconds per round that it takes to clean the primer pocket with a cleaning tool. The idea of creating accurate ammunition involves consistency and repeatability. If you never clean your primer pockets, doesn't it stand to change the primer pocket after every round in terms of seating depth for the primer? May be nothing at all, but I like to start my loads with a clean, happy piece of brass.
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