I built 2 257AIs for my sons, love them and they do too. Factory 257 loads are loader lower than the modern actions can handle, that is why they came out with the 257 +P loading. In a modern rifle you can load it to a AI level. For deer and antilope, hogs ect they would not know the difference. I loaded the 115 grain nosler partions in it and a drt killer, I am sure for those size animals the 100gr NP would be too. Both sons have take Elk with it. It would be fine for black bear with the 120 grain bullets. The cartridge started to get over looked when the 243W/6mmR and 2506 came out and gun writers sang there praises, which they are fine cartridges also. That happens to allot of cartridges, 7x57mm, 280Rem some of the 22 calibers. A previous poster seem to compair it to a 270 3006 ect, maybe I mis understood, but I would not put it in those classes unless, he was talking as a deer, antilope, sheep, goat killer, plus is is more suited for varmits. Recoil in minumal, right now I am debating between another "Bob" or a 6.5x55 Swede.another cartdridge that has met the same fate, and can be loaded hotter then factory loads in modern rifles. If you go with the Bob it is a reloader cartdrige for 2 reasons, lack of availability of factory ammo cheap, and to get its full potential. So concider that, or having a friend reload it for you. If you become an advit shooter reloading is a great hobby, safe and keeps cost down.
Bob