Just got finished reforming about 75 223 cases to 17 fireball. First I annealed the cases and ran them into a 221 fireball die with expander ball removed. Next step was to trim some of the neck and deburr. I then re-annealed the cases and expanded the cases necks prior to outside neck turning. The cases were neck turned them to 0.012" wall thickness and trimmed to 1.410".
The cases were then sized in a 17 fireball FL die. The resulting cases had a 0.014" wall thickness and shortened by about 0.010-0.012"