I'm familiar with the idea of annealing cases that have work hardened from multiple reloadings. I've also seen old military brass cracked at the case neck, presumably from an aging process in the brass.
I've happened on a number of NOS cases in hard-to-find calibers that I would like to maximize the life of. What is the collective wisdom on annealing before using these new (old) cases? Will it make a difference in the case life?