RE: 7mm Mauser (7x57)
Regardless of velocity and accuracy potential, all cartridges mentioned are good in their own right. It's all a matter of personal preference.
Personally, I'd love to have both the 7X57 and the 6.5 Swede. The animal isn't going to be any deader with the difference of a few hundred feet per second, one way or the other.
Reddbow