I haven't ever used a AK-47 for them, but I have used the round in MANY SKS's, I've used a few of them on deer, and most of them on coyotes, I've never taken one for hogs yet, but on deer it does well enough...my best SKS shoots 2MOA or better out to 250yrds (100yrds@2MOA=2" groups, 250yrds@2MOA=5" groups---I usually get sub 1" groups at 100yrds) with hunting grade ammo. I've successfully used it to a bit over 200yrds on deer, and to about 275yrds on coyotes. Don't use hollow points on deer, they're far too volitile, but don't use FMJ's either, remington corelocts (I hate saying anything good about remington ammo) do pretty well, they're not the most accurate round out of my SKS's, but they're probably one of the better bullets that are readily available for the 7.62x39mm.

Bullet tumble isn't specific to the AK-47, not matter what cartridge/gun/bullet/velocity combination you choose, your bullet will become unstable and begin tumbling at some point, in the 7.62x39mm, it's a little sooner that say it would be in a .30-06 (on average) because it's not as fast and often they aren't rotating as quickly (twist rate x muzzle velocity gives rotational "speed"). Don't take this into consideration much, your accuracy will suffer more than anything, hitting the target will be hard to do if your bullets are full keyholing (hitting perfectly sideways) in their tumble. If they're tumbling that bad, they're NOT going to fly straight, you might get huntable groups, but not likely. Test some different brands too (not surplus crap, real hunting ammo).