I'm convinced the 308 at most practical hunting ranges, inside 500yds kills better on light game. Bigger bore diameter more damage, but the 6.5 packs more down range energy, less wind drift. I have both and both are easily made accurate. For me, wind drift is the single biggest reason for lr misses so I'd probably keep the 6.5 if I had to choose. But I'm betting if you bought both and put different scopes on, you would prefer whichever had the scope you prefer lol