Last two moose I shot were with 308 Win, with 150gr round nose bullets in moderate load. Switched to this as others had proved excessive. Both mooses died in their trackses!
Next time will likely move on down to my 6.5X57, perfectly adequate. If I owned a 30-30 in a decent rifle, I might use that, but I select the rifle to take hunting by the way it points and feels. I personally have not yet found a 30-30 that feels right for me (Badgers are funny looking, wide, low slung critters!).
Answer to original question might well default to the .308; if the questioner doe not have confidence to just go and use the 30-30, he is the best to judge, he may well do better with his .308.
This IS all relative, one answer or another, depends on the circumstances. It is pointless to argue unless we know for sure that we are all starting from the same set of initial assumptions.