270 is fine. As far as a mooses stamina, everything thing dies when you get a proper hit and pop the lungs. Moose just happen to have a larger kill zone.
I have only killed 5 moose, 4 were with 300 win, my 5th and biggest was with an arrow. A 270 is way better than an arrow. Those were in AK. Oh, my friends used 308, 06, 270. The 300 was the only rifle I had then.
There is a difference between hunting with a gun bow. If you bow hunt elk, take your bow. It is as close as you can get to hunting dinosaurs in N. America. And you can always use you 270. Put an arrow through one!
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