I currently run a .260, but want to build another rifle. I know I want a 6 or 6.5, but don't really care which. Of course, the number of choices is large, so I created a list of requirements to eliminate the choices. Fire-form = no, good case life = yes, small/large primer = don't care, blah, blah, blah... One of the more important requirements is multiple powder options. In your experience, which cartridge works well with different powders?