Back in the day before fancy annealing machines, I probably made a couple of thousand cartridges from 30-06 and they were all annealed using a torch and dark room method. I made 7.65 Argentine, 6.5, 7 and 8mm Mauser and a few others I can't remember and they lasted a reasonable time. Of course I also used to fire form my home made cartridges with 10 grains of bullseye and a case full of corn meal if I didn't load them up with the required bullet. (mostly for the full and semi autos)