I did a lot of serious packing when I lived in Alaska. For that heavy work I used a custom pack from Barney’s in Anchorage. IMO, there is not even a close second for hauling heavy loads out of the wilderness.
For lighter work, like humping hills for Coues, or the type of hunt you describe, I have two Eberlestock packs, the gunrunner and the one pack. If you’re boning and packing the critter out, the one pack is the way to go, if you have a guide who seconds as a mule, the gunrunner is fantastic. Rifles insert in an integral sleeve on these packs.