For me, I think my 8mm Rem mag or my 338378KT is better for elk on up than any 30 caliber. Will a 30 work? Sure it will, but when the chips are down, I want more bullet weight and a larger bore.
Yay for the Big 8. I have an 8mm Rem Mag myself. But I've yet to draw an elk tag, so what do I know?
