I use a candle myself, my milsurps are too inaccurate to tell if it improves accuracy but I do it to extend case life.
Your question about consistency in annealing goes to the heart of the matter: is annealing a matter of degrees, or is it either achieved or not? If it's a matter of degrees, then an automated machine is the only way to go, if it's mainly a matter of just doing it or not then most methods will do.
I suspect that a lot of what we call "annealing" is actually not "annealing" but "stress relief" which can be achieved at lower temperatures.
Heat Treating of Copper and Copper Alloys
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