7-08 is a ballistic twin to 308 with the same recoil. On paper it is a LITTLE better than 308, but we're talking about somewhere around 2" less drop at 500 yards and about 35 ft lbs more energy at that range when best loads are fired in each. 308 is about 1/2 the thickness of a dime larger in diameter. I like the 7-08 in theory but could never pick one over the more common 308. But I won't argue with someone who prefers the 7-08. They are REALLY close in performance, but 308 has always been easier, and cheaper to find.
The 6.5 does everything 270 does with recoil closer to 243. It shoots the same bullet weights as 270 about 150-200 fps slower at the muzzle. But the more aerodynamic 6.5 bullets come pretty close to catching up at 300 yards. I can't imagine any animal noticing the difference between 270, 6.5CM or 7-08.
Since I already own 308 and 30-06 going with 6.5CM was my best option. Recoil and ammo availability were also big factors for me. But depending on what you already have 7-08 might be more appealing to you.
