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How long to dry brass in the oven?

You can do it at 250 for 15 minutes. Get it above the boiling point of water and it'll dry out fine. Brass won't start changing properties with heat until around 400 degrees so you are safe.
 
I just toss wet cases in a corncob media tumbler. They're dry inside 15 minutes all the same in my experience. That said my relative humidity might be lower than, say, Florida.
 
I just toss wet cases in a corncob media tumbler. They're dry inside 15 minutes all the same in my experience. That said my relative humidity might be lower than, say, Florida.

I ditched my traditional tumblers when I got the SS media, and tumbler. In the summer here we sometimes get humidity in the 90% area too.