I just shoot the damm things, bow or rifle, they die pretty easily. Have shot them in the shoulder, behind the shoulder, in the neck, in the head, all shots have killed em. Moose are about as dumb as it gets, and with that goes the fact that they dont often even know they are dead for a minute or so after being shot. I wouldn't sweat where to shoot a moose, just make sure its a vital or roll the dice on a CNS and remember that with either a follow up shot might be needed, they dont move that fast.