Burns less powder than the 7mm Mag for the same power, makes a lot of sense to me folks. The SAUM's a better cartridge than the 7mm WSM, as it doesn't have the shoulder "artificially" bumped forward shortening the neck like the WSM to prevent chambering in .270 WSM chambers. Better case to reload than the WSM by a hair, if you ask me. ...and if you can have a more efficient 7mm Mag in a short action, why not! Then again my go to gun's now a .375 H&H, not exactly state of the art and less efficient than the .375 Ruger, so I see both sides of the fence. I just don't agree with the calling of new, and good cartridges useless and redundant, they're not.