In reality, no animal will ever know if the 7mm 160 grain bullet that killed it had a MV of 2,550, 2,600, 2,650 or 2,700 fps.
Sure, it may make a difference in terms of trajectory, but if you want a flat shooting non-magnum 7mm for longer ranges, try a .280 or a .280 AI.
The great virtue of the 7x57 in my admittedly limited experience with it is light recoil, good accuracy and the ability to shoot 160-175 grain bullets at "reasonable" ranges.
Within the range of speeds you list, I will happily accept the load which proves to be most accurate. If the shot goes precisely where I direct it, at even 2,400 fps MV, I'll still be stuffing the freezer. The thing is, sometimes the best accuracy with a particular bullet and powder combination comes at the higher end of the speed range, depending on its preferred load density, but certainly not always.
