The good Doctor, has given you the best way to do it. I have used another method for a long time and it works, but if you contact Hornady they offer a case annealing kit. They use a product called Tempilaq that does basically what our welding temperature sticks do, theirs is a 475 degree stick. So you can just buy the stick or the whole kit, I would imagine their holders work like a heat sink and protect the rest of the case and let you do as Ken has suggested.
