The 7 SAUM is functionally a .280 AI that will fit in a short action--the case capacities are within a grain or two of water, depending on the head stamp. The 7 WSM (which also fits in a short action) will give you another 100-150 fps with a 140-grain bullet. There seem to be a lot more rifles out there chambered for .270 WSM and .300 WSM, and both of those cases can easily be re-formed to 7mm WSM.
