RE: 7X57 rifles
The numbers are the numbers and the 7x57 wins? If you reload, you may be right, but, for factory loads the numbers are different.
If you're looking at factory loads, the Remington 140 grain PSP CL in 7mm-08 leaves the muzzle at 2860. The same bullet in the 7x57 leaves the muzzle at 2660.
Most people use factory ammo.