I learned how to anneal using Tempast or Tempek, or however it's spelled, it's in the shop at home and I'm at work. Yellow liquid like fingernail polish. Changes color.
Now I hold the cans between my fingers, heat the neck while "twirling" and just as it starts to turn red I dunk neck first. The portion I'm holding doesn't even get warm. I've done hundreds of .223. 308 and 30-06. "ONLY" the two that I have gone straight from dunking to the die have had a problem. So I won't go straight from dunking to sizing anymore.