There are two separate, different hobbies: Elk hunting, and then there is talking about elk hunting rifles. There is some overlap.
In thirty years of living around elk hunters, a smattering of my own elk hunting, lots of deer hunting, and including a few years selling guns to elk hunters and guides, I am convinced for the hobby of elk hunting, physical conditioning and the ability to place a reasonably accurate shot quickly are the two most important factors.
I don't think there are many elk killed that couldn't be killed with a minute and half rifle, in about any cartridge from the 260 on up, a Nosler Partition and a four power scope.