Going back to the OP’s question I would have to ask what the intended use is. If it’s for stalking under 300m then I would go with the 308 every day of the week and twice on Sundays as it hits harder close in. If the OP intends to use it for long range shooting or needs to take deer at ranges over 300m then the higher BC of the aerodynamic 6.5 mm bullets does have advantages