Hunting is another word for surprises... a 308 would be a very good compromise. Just seems to put deer down a bit quicker at the shorter ranges, say below 300m. 6.5's did not and still do not have a good reputation in our part of the world for deer, especially on evening stalks. I shoot a 6.5CM my friend a 308. His deer just drop that bit better or run less with better blood trail. If I didn't have two dogs to track I'd probably use my 308 more. 308 has probably the best ammo availability and long barrel life so the deer rifle can be used to practice without worry.
edi
edi