I use 150 gr Federal Premiums in my 7 mag, with which I've shot many deer and half a dozen moose. The moose shots have varied from 30 to over 200 yards and none has ever gone more than 25 yards before tipping over. In my experience, it doesn't take an extraordinary bullet to kill a moose efficiently.
Most recently:
http://www.angelfire.com/bc/canuck2/current2007.html