Remember, a 308 does everything a 30-06 will do just 100 yards closer. I’d not hesitate to take an elk at 400 with the 308, and even 500 yards if the tracking conditions aren’t bad - it’s going to croak, it’s just nice to be able to find them.
Personally, I’ve chosen 165 gr Partitions for the 308. Accubonds a have a better BC, but under 500 yards it doesn’t amount too much. The difference in penetration between 165s and 180s is minimal - neither the animal or you would be able to tell the difference. Without dialing it’s also a little flatter shooting, which doesn’t hurt.
I walk around with the scope set for 300 yards - without dialing you hold a little under the back for 400 yards and bang bang.