Personally, I'm partial to the Higher BC, 6.5 MM Bullets and absolutely LOVE Shooting, my Braked, 6.5 Creed with, Hornady 130 gr ELD-M's or, Berger H-VLD's / OTM's ( Low recoil and VERY Accurate at, 2,800 FPS, +)
I would have gone with, the 6.5-06 Ai IF, I had that Long, Rem 700, action ( Just my opinion ) and had me, an Extreme Range,.. Antelope / Deer/ Predator and LR Steel plinking Rifle,.. SUPREME !
.25-06 Ai would be, My Second Choice, for sure,.. BUT,.. either would Be,.. the E-Z Button !
Slightly BETTER, Barrel "Life" by, going to,.. the 6.5 Bore AND,. you could go Up to, the BEST BC, 6.5 Bullets,.. the 147 gr ELD-M's or 156 gr Berger Elite Hunters as, the 6.5-06 Ai, HAS, the Horse Power to "Drive" them,..
if, desired.