I own a 7-08, a 7x64, a 280ai, and a 7 Rem Mag.
In all but extreme distances, I can't tell a bit of difference in how they kill, except the 7 Mag.
Its yet to be bloodied.
Each is a different rifle, for a different kind of hunt.
I can say the 7 Mag does have a bigger thwack sound on steel !
I like the .284 bore !