One thing I forgot to mention in the earlier post: I use MAPP gas in my propane torch - I think it is a little hotter than regular propane. It's also kind of interesting how certain calibers need this more than others. I almost never have to do it with my .22-250 Ackley; where I sometimes load cases more than 20 times. But in the 6MM-284, they will crack on about the third or fourth reloading without annealing. Always wondered if it had anything to do with the fact that they are already squeezed down from 7MM to 6MM - ie. work hardened - before I ever start firing them?