I might add that of the long range options the 270 is the only one that was never a military caliber. Maybe that had something to do with it. 6.5, 7mm, 308, and even .338 have been military options.
What about the 6.8 SPC?
Who adopted it? As far as I can tell it was an experiment that some special forces members wanted, but didn't get picked up by the military.
