Are those rifles M-14's?
Negative GhostRider, eh 3RAILKICK
Those are M1 Garands and according to General George S. Patton, the greatest battle implement ever devised.
The 7.62x51mm, aka .308NATO used in the M-14 was designed to have identical ballistic specs to the 30-06. The shorter length of the 308NATO cartridge feeds better in the shorter action of the M-14, and other semi-automatic assault rifle designs of the time.
The closest to an M-14 in 30-06 is the Beretta BM-59, licensed copy a M-1 with a detachable magazine.