I've carried a bunch of deer and about 50 elk out in a pack. Its a personal preference thing on packs and the most important factor is fit especially when you add a significant amount of weight.
I'm currently using a McHale, which is probably overkill for a guy of avg height- I'm tall and most off the shelf packs just didn't fit well so I finally pulled the trigger and you can't find a better pack at any price.
Frames; The old Dana frames are good if you can find something like the K2 on ****. Barneys makes a good frame pack. The run of the mill Kelty's are OK with the Cabelas frame bringing up the rear.
Internal frames best to worst, IMO; Kifaru, Mystery Ranch....then Kuiu, mountaineering packs like Gregory, Osprey,etc.... then a bunch of others like Eberlestock, Crooked Horn, Cabelas, etc
I give Kifaru the edge due to them being lighter than MR- both excellent quality, made in USA and then a significant drop to the next 2 levels of packs. Some of those Eberle are close to 9# empty and of Chinese quality- but cheaper than the top tier packs.
If you have a shop that you can add bean bags and walk around with them is best.