.257 Weatherby magnum is an absolute Elk Anchor. 115 grn BST will zap an elk like no bodies business. Okay, I grant you that are a bit expensive but excellent round. At the end of the day though I go to .30-06 or .308 if I have my druthers. Way cheaper to shoot plenty of choices for shooting.
It is pretty exciting watching an elk fold like a lawn chair with the Weatherby though