You might be smoking something.... A "gram" is 15.4 grains.
Plus, Wikipedia is often FOS. Am sure whoever posted that "measured" capacity by filling the cases to the mouth--which is NOT the most accurate way to measure capacity. Instead it should be done with a bullet seated. Even then, in different brands of specific 7x57 and 8x57 cases (or .270 or .30-06 cases) powder capacity will often vary 3 grains.
And three grains difference in powder capacity in that size case means just about zip, since as I've explained before, any difference in powder room results in about 1/4 as much in velocity, when both cases are loaded to the same pressure. 63 grains is 5% more than 60 grains, which means a 1.25% difference in potential velocity. This means a 35 fps difference in velocity with loads around 2800 fps. Most handloads will vary around 35 fps when firing 5-shot strings.
