Either will do the job fine. The advantage of your Whelen is that you already know your rifle. When the chips are down it is better to have a rifle your reflexes are tuned to. You will make all the right moves in a hurry - the first try. That could make the difference in getting off a successful shot.
Agree with others, spend the money on other gear you need, like a good pair of boots that you start breaking in now, and add a new memory to the Whelen.
(This said by a person whose go-to rifle is a 7 mag.)
Also get in shape.
