I can be convinced for the need of a larger 338 when your talking longer ranges and wind. But the average guy shooting average elk does not need nor should feel they need anything larger than a 30-06 or a 270.
If you can shoot a heavier recoiling gun as good as a light one then rock on but your average guy get pounded sighting in then is all messed up when you put them in front of elk and then it's you job to put down the wounded game so he can get his pics and tell everyone that you have to shoot a cannon for elk cause they are so tough. BULL!!!
Put a bullet that expands through there lungs and they are dead. Just my two cents.
PS: Friend don't let friend shoot elk with 7mm's.