A truly powerful air rifle might be viable for small game procurement. I'd be interested to see where you can find a .177 pellet mold however.
I think if I was going to choose an airgun for hunting, I'd pick a .22. It's easy to get caught up in the velocity game, and choose .177 because it's a faster caliber than .22 when fired from the same airgun. But, the really fast .177 pellets can go supersonic. If the target is far enough from the muzzle that the pellet drops down below the speed of sound, there is a lot of turbulence in that transition that can adversely effect accuracy.
You're better off with a heavier, slower .22 pellet that never goes supersonic. The potential for accuracy is better, and the heavier pellet can impart more energy to the target.
(This is all just my opinion, of course.)
As for the seriousness of this topic, well...
We'll play along. I like air rifles so no biggie.