Those velocity numbers are the same that Remington is now claiming for the 30 AR:
"Remington is loading it with two bullets at 2,800 fps: 123-grain FMJ for practice and target shooting and 125-grain pointed Core-Lokt for hunting. "
http://www.rifleshootermag.com/ammun...04/index1.html
Seems you need a bigger case capacity to get those numbers.
If the velocity numbers were true, than the lower capacity 30RAR could out perform the 308 Winchester??? Well if you look up those numbers they only compare if you use a 125 grain in the 30RAR compared to a 150-168 grain the 308 Win.