Use the .308 with 180 grain bullets. That will be fine if you confine your shots to 250 yards or less. Speaking for myself, I ought to confine my shots to 250 yards or less for no other reason than that is a relatively long shot and it becomes a challenge at longer range to land your shots on target. I know there are other expert shooters on this board who feel confident shooting further . . . but a man's got to know his limits, as Clint Eastwood would say.