People lose the forest for the trees so often. Nobody argues that the .30-06 is a "legitimate" elk killer. However, you neck the exact same case down, seat a bullet that is .051" smaller in diameter that is faster and flatter, and all the sudden it's "not enough gun". ROFLMAO!!!
EDIT: I forgot to mention, the .270 Winchester. Again, grand consensus says it is a certified elk and all around "one gun" for big game. Same exact case as the .30-06, and .02" bigger in diameter than the .25-06.
No elk alive would notice the difference being hit by a .30-06, .270, or .25-06, at appropriate velocities for the chosen bullet.