Generally speaking it's recomended that you have 1500 ft.pounds of energy at the distance that you're gonna harvest the elk.So according to federal's ammo website the 308 using 180g nosler partition you'd have 1672 ft. pound @ 300yds. With the 30.06 with a 180g nosler partition you'd have 1591 ft. pounds @ 400yds.

Both are simular and if I had a 308 I wouldn't go out and buy a 30.06.Me personally I'd take the 308 until I found out how much future big game hunting I'm gonna do then decided if I need more gun.

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