308 has been my favorite up till now. I think that its on the light side.
My suggestion. Call or email a Guide Service located in the area you intend to hunt and ask what they would prefer their clients/hunters to bring along for there Elk hunts? (caliber/s) Than you know exactly what caliber is the preferred weapon of choice by a professional elk hunter.
After all spending that kind of money TheDutchman19 on a rifle & scope. You want to be prepared for whatever comes your way when it comes to Elk.