Muzzleblast is right, though I think they went to the 150 in like 1904, and then upped it to 170 grains to maintain their edge over the German 7.92x57mm bullets. Recoil complaints from the field then forced them, in 1906, to re-adopt the 150.
Recoil complaints? Certainly warranted from guys not used to shooting, but it makes me wonder what they thought of that original 220 grain monster we were throwing at the bad guys!
Yeah, 199, 197 grains, something like that. I think it was actually just before they started WW2, probably to try to keep up with the heavier American bullets. Unlike the Americans, though, they didn't lower the grain weight, to the best of my knowledge. But then again, in my opinion the 7.92x57mm Mauser rounds kick considerably less than the old .30-06 did. No real reason to jeopardize performance if it wasn't bothering anyone, merely to stay neck-in-neck with the Americans.
Speaking of the Brit .303 round, the original load (of a different name, though I am unsure of what) Was a 10.4mm .40 caliber bullet of something like 300+ grains! Thats like the same type of bullet the rich people went to Africa to kill elephants with! It was done because the Brits were unsure if they should drop their bore diameters too far from the .54, .68, and .72 caliber muskets they had just recently been defending their empire with. The original Russian Nagant rifle was also of .40 caliber.
Still don't think I would like to be issued one of those...