The purpose for annealing isn't for making the brass last longer, that's a side benefit.
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I freely admit I thought that was the whole purpose. What is the use in doing it then?
Uniform neck tension loading to loading is the main other reason.
Dead on!
When I was shooting hundreds of rounds a week I did a number of tests on accuracy. I've posted before on this. The second reload after annealing was the most consistently accourate. I annealed after the 5th reload and started the process again. After that the brass is just too hard for good neck tension. The first reload was never the most accurate. I surmised that another (2nd) sizing uniformed the neck tension a bit. Never tried resizing twice without firing on a first reload. After second reload, accuracy started tailing off due to hardening. On belted cases seldom got more the 11-12 reloads before you could feel the bump of incipient head separation at which point I'd start with another batch. Serious hunting loads were always on the second reload. Never a problem.
