Well, I have been schooled by another thread.
Apparently there are posted minimums for muzzle energies for moose in Ontario. According to that CGN member Ironsighter has concluded that most rifles used today can't really kill a moose at over 200yds both due to accuracy and insufficient terminal energy. As a matter of fact by his view, you can't ethically or humanely kill a moose with a .30-30 placed firmly against the ribs of a moose since it doesn't have the REQUIRED 2100 ft/lbs of muzzle energy to do the job.
See here for the thread
http://www.canadiangunnutz.com/forum/showthread.php?t=586774&page=8
Better get yourself a .400 Tyrannosaur, OP since you are more likely looking for a 300-400yd rifle and you NEED the right amount of energy to get the job done.
Or, if you follow his advice, it is just inhumane to take a shot over 200yds anyway.
This is some funny stuff....check it out for a laugh.
Seriously, though, get a .308 and you will be fine. My sister in law has shot 7 moose with hers at ranges from 75-350yds. If a girl can do it, you should be able to....
So get one and shoot with it. Know where the bullets are going. And then shoot the game.