How often do you anneal your brass?

I tend to load 50 or 100 at a time. Once I've shot them all once, I anneal. And every firing cycle after that. If you have an annealing machine you might as well each time. I can anneal 100 pcs in 30 minutes or less and it gives me consistent neck tension and shoulder bump during the sizing process. That's a big part of what we're trying to accomplish. I've went 3 and 4 firings without annealing and measured brass after resizing and I've seen .003" in variance. But when resizing each time my shoulder bumps are literally within .0005" or better across 95% of 100 cases. That's reason enough for me to anneal after every firing!
If you don't want to anneal after every firing, I would at least do it every other and no more firings than 3 cycles before annealing.
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