If the head honchos of the firearms and ammo manufacturers were reading my post, I'd put some brains and heart into it. For those who will read it, I'll say that I think the 7mm's are the top of the bunch of short mags, and that the SAUM case was better thought out. All are handicapped to some extent by short actions, magazines, and barrels. I'd love to have a 7 SAUM in a std length action with a 25" bbl in a factory 700. That won't happen for several reasons, so I'll end up going semi-custom, as others have mentioned.
