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I have never annealed cases, but I notice that new Lapua cases are annealed at the neck, so maybe it's not a bad idea. And of course, keep pressure within reason and don't push those shoulders back much.
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I think all factory rifle cases get a shoulder/neck annealing step at the end, to prevent stress cracking. I believe this is discussed in books by Phil Sharpe.
Consumers like shiny cases so factory cases are tumbled to remove the evidence, but the US military leaves the color layer on.