weigand,
There are some recreational backpacking packs that may do alright as a hunting pack, but as the other said, they aren't made for hunting. I am glad your osprey is working for you. I can assure you it was not made for hauling "pack-out" type loads (120 lb. plus). If you don't believe me, call Osprey and ask them what loads they recommend for your pack.
The premium packs (Kifaru, SG, Mystery Ranch, etc.) were, and they will do it with surprising comfort. They are also built to a higher level of durability. You could throw them off a cliff.
I think it is fine to try to make one work, but that is not what they were made to do.