I'm not sure if a .308 will take down a bull elk .
I have a Bushnell Elite Tactical 3.5-21 50mm that will do the job nicely!
http://www.bushnell.com/all-products/rifle-scopes/elite-tactical/dmr-3-5-21x-50mm-g2dmr
Be sure. It will.
I would definitely use the 30-06 for elk. The nice thing about 30-06 is its grain range. You can go from 150grain to a really heavy 180 gr. I have heard it called the ultimate North American round because it's literally good for all big game on this continent.
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I love my 30-06 but it is more expensive to shoot than the .308, not a problem if you are using it for hunting and not shooting much. The main reason i wish it was a .308 rather than a 30-06, other than the cost of ammo, is that i want an AR-10 would have to stock up on .308 as well as the 30-06. I think it would be convenient to be able to use both platforms with one caliber. Just a thought.