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As for what part of the case gets annealed, everything I've seen from the factory processes run the case TOP through the annealing coil,
They don't make any effort to keep the heat from transferring to the lower case.
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They don't need to worry any more than those who use any other method, since if you heat the neck quickly enough, there will be little transfer to lower portions. You can see on new brass the color changes on the necks alone.