I had some new .223 brass that I made into 6.5 TCU. Never had any problem with it. I then used another 20 of that same batch, making exactly that same load, but never shot it for quite a while so it was not fireformed yet. I finally got around to shooting it and on fireforming about 3/4 of the cases got a neck split. I'm scratching my head...
Are new cases annealed, or do they need to be annealed? If so, I'd like to hear your procedure for annealing...
Are new cases annealed, or do they need to be annealed? If so, I'd like to hear your procedure for annealing...