I anneal all rifle calibers larger than .223 EVERY time. This is overkill, but I end up with range brass of unknown origin and annealing is a quick and easy way to make the brass serviceable. Realistically, every 3 or 4 firings would be fine.
I anneal in a pie pan of water. Heat the necks till they glow cherry red and tip them over in the water.
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"Robo is right" Fuzzball