If'n you want to know what will do for 90% of the hunting 90% of us can or will ever do, as was suggested previously, go into any store that sells ammo, and see what is on the shelves. The further out in the weeds, the better.
Dollars to donuts, 4 calibers will be there for Big stuff! 30-06, .308, .270, and 7mm Remington Magnum. Eastern or Western game, long range or short, It makes little difference.
.338 may be there, too, but no guarantees.
For smaller, .243, 30-30, and .223 will almost certainly be present.
although good calibers, the .260, 6.5 X 55 Swedish, and 7mm08 may be hard to come by in the outback.
The Short, Fat Magnums are an aberration, IMHO
Anything else is "about equal" to the old standards, and not much of an improvement, in most cases, I think. Marketing at it's best!
My .270 did well on elk, and at college, I knew a girl from Wyoming that loved to hunt elk with her .300 Savage. I like the .257 Roberts, and I knew an old Idaho sheepherder that swore by his 25-06. All were "enough gun" for the purpose. Some are obsolete, but all do the job.
But, if you want the security of knowing the ammo will be there, The "Big Four" will do just fine. Oh, but I'd NEVER forget/lose/pack the wrong size ammo!
Mr. Murphy LOVES to go hunting!