While the m1 Garand was to be basically a .270, all that ammo is what influenced the decision for 30.06.
Pedersen measured it at the lands, it's a 7x51 more like a lightly loaded 7mm-08. Too bad Garand didn't chamber it in 6.5 Sweed, THAT would have made a great combo and might have been worth issuing as is.
Edit: Hey I just learned something. Went reading about the Pedersen rifle and he also had a 6.5mm version. The mil tested both his cartridges against the 30-06 and the 6.5 was the most lethal of the three, on pigs anyway. Bet it had less recoil and the best trajectory too. But the mil preferred the 7mm version, then dropped that one too.
