The 165gr is a little light for Moose from an 06. I won't take mine out with anything less than 180gr, preferiable a 200gr Nosler. Moose are big animals, and hard to drop.
Once it's growen there is no such thing as a small Moose. Their Big and BIGGER period. My Dad is an old Tennessee plowboy. A few years back when he came to visit, he shot a Bull Moose. I'll never forget him standing over the animal staring and saying "Lordy, lordy, lordy, where do we start". He was so overwhealmed.