back in the cup n core days guys wanted heavy bullets with large sectional density to penetrate the big stuff. I think better bullets change that a little.
I've killed elk with calibres ranging from 25-06(120 grain partitions) to the 300 weatherby.
I agree with others - the choice of calibre is less important than some other considerations. How are you with recoil? I know my 300 wby can loosen your fillings if you are not hanging on. I shoot it enough to be competent, but don't enjoy it at the range.
I have a couple friends who shoot smaller calibres - and for them I am much more confident they put a smaller bullet in the kill zone, rather than spray an pray with a uber magnum like a cat crapping razor blades....
All that said I own a 308 Norma mag, a 30-338 and a 300 wby, so you know what I favour lol.