Overkill and probably a heavier rifle than I'd care to pack around.
Moose are not difficult to kill if you can place a lung shot.
A big AK-YT bull has lungs near the size of a wash tub and your Newfie moose should be nearly as large.
One shot I hesitate to mention......should you really screw-up and have a wounded moose running away,
a pelvis shot can be very effective.....bad for meat but better than losing the animal. A broken pelvis will drop the bull
and there are several large arteries in that region also.
Calling bull moose in for a close shot is one of the more exciting hunts I can think of.
Good luck on you rhunt!