There were a few iterations of ammo for the 1903. I'm no expert by any means. There was a 220gr round nose at about 2300 fps, then a 150 gr at 2700-2800 fps, then there was a 172gr at about 2600 fps.
Then there were the different iterations of the 1903 itself. I don't have a clue what ammo the sights were calibrated for in any or all of the different variations.
IIRC, from an old Jack O-Connor article, the original .30-03 load was with a 220-grain bullet at 2,200 fps.
Then in 1906 they developed the .30/06 load with a 150-grain bullet at 2,700 fps.
The M-1 load, not the rifle, was developed in the 1920s and it was a 172-grain bullet at 2,600 fps.
Then the M-2 load was developed in the 1930s, for the M-1 rifle, and it was a 150-152-grain bullet at 2,800 fps. That's the load that we used in WW2.
