Pete, I've Moose hunted Alaska for well over 40 years. Probably closer to 50. Moose are about as unpredictable an animal as one can find when it comes to "fight or flight" response. You absolutely never know if the thing will charge you or run away. Your "city" Moose up there have no fear whatsoever of man as many Alaskans can attest to. But out in the wild, some do and some could care less if you were sitting on top of them having a Coke and a smile. As far as Maine, I've had them wind me when I was deer hunting and took off, then others I know for a fact winded me and couldn't care less.
Bronko, your plan to carry the 06 as a backup is a good plan. If your rifle will shoot them well, I would recommend a 220gr RN Interlock for it. Some 06's don't like them. If yours doesn't like anything over 180gr like a couple of my 06's then load up some 180gr Interlocks. And if possible, have a big ole tree very close by just in case you have one of those "oh crap" (censored meself there

) moments. They might be big and ugly but them suckers are meaner than a molting rattler when hurt. And they are a heck of a lot faster than you would think.