308, 30-06, 300WM all work fine on antelope, any deer, black bear, elk, hogs, moose and probably, though I haven’t taken one, lower 48 grizzly.
There are excellent factory loads reasonably priced for all. With Handloads in my experience, the 30-06 is the best from suppressed, learner loads to 200gr dark timbered moose and elk loads. They all work in Africa up to and including kudu, Wildebeest and tough old zebra. Eland you should have a bigger gun I think, although if that’s all I had, I’d go for it with a good premium bullet.
JMO from a few years experience.