One more perspective, FWIW: I have both, like both, and have used both quite extensively on Texas deer. I can see no difference in performance between a 257, 120gr and a similarly constructed 277, 130gr bullet launched at about the same velocity.
I have a slight preference for the 25/06 because, at least in my 25/06, the recoil is just enough lighter that I can see the bullet impact and watch the deer's reaction to the shot.
