I anneal for my Benchrest rifles cases. Thats because the Lapua brass we use is so expensive. If you heat a case neck and shoulder until it is cherry red you have basically ruined the case. The brass is then dead soft. You should anneal in a place with low light level and just as the brass turns that purpleish color is enough. Thats about 550 degrees or so. I set up two propane torches opposite each other. The case is held in an aluminum piece that is turned in a cordless drill. About 3-5 seconds in the flame is enough. Don't anneal further down the shoulder than about 1/2 inch, depending on the case of course.
Don
Don