Little trick on the MainFrame for guys with bigger shoulders, call them and get the bigger belt and shoulder harness. Was a game changer on it's comfort for me.
The best thing to do in all honesty...is find a way to get to a store where you can try a bunch of them on. I wear Zamberlan bootsa lot and they fit me well. So do Kenetreks...after I figured out that a 12W fits me better than a 13, which is what I wear in most other European built boot...
Montana has quite a bit of opportunity, the biggest thing is getting to know the regulations, maps and then also travel rules to respect landowners and the land.
Good luck!
It's funny how when the plan changes it messes with us so much. Checking regulations has become second nature to me with a few season splits that have started to happen around here for deer.