Given the OP's parameters and given I have only one rifle to hunt all of North America under any conditions....Hmmmmm.....FN Extreme Weather in .338Win. with a Leupy 2.5x8 in Talleys and a very good 210gr. to 225gr. bullet.
Now don't be trading in your newhaven classic that you just spruced up for something like that. You've already got a very nice 338 win model 70 that fits that bill......