Interesting, Saskie. I look at it the other way around. If you're a "serious" moose or elk hunter, I assume that means you hunt them year after year. In that case, I'd be willing to use a .270 because I would know that if I don't get the shot I want there's always next year.
On the other hand, if this were a once-in-a-lifetime, drew the tag and goin' huntin' I would want a bigger rifle so that I wouldn't be afraid of taking shots that might be questionable with a smaller caliber.
Just amusing to me how different people look at the same set of circumstances but come to completely different conclusions.