Will the nickle crack and split if I am trying to neck up 25-06 brass? I'm working on a project, and am considering all options. If I choose a 6.5-06 for my build; I will be using nickle cases to differentiate it from an-other 25-06 savage in the cabinet. I am concerned about mixing the ammo. I know 6.5 "shouldn't chamber" but it is close enough that I could see a mix up happening, at some point.