RE: What rifle will cover ALL my needs???
No matter what or where you hunt the KISS principle always is #1. Simple rifle and optics with readily available ammo. The proven platforms, Win model 70, Rem seven or 700, win 94, marlin 94, etc. will seldom let you down. The more obscure the optics the more difficult getting repairs in the field.
No matter where you hunt in North America you can always find 30.06, .308, .270 and 30.30, at small stores and even in camp. The odd calibers can be tough to find, i.e. .300 SA ultra mag, 25.06, 7mm-08, etc.
I can only find one store that carries .300 SA ultra mag in this metro area and they had 4 boxes, two options, that can be a problem.
Good luck