My vote is for the 6.5x55, lighter for some game, heavier for something like an elk. That cartridge seems to be very versatile, and my father-in-law's sporterized Swedish Mauser doesn't kick very hard.
"... I cannot but conclude the bulk of your [politicians] to be the most pernicious race of little odious vermin that nature ever suffered to crawl upon the surface of the earth." ~ Jonathon Swift