I currently have a .177 break barrel Crossman 1000x. Easily capable of taking down varmits such as rabbits and squirrels. Although I am not at all impressed with the sights. The scope it comes with can be calibrated to easily head shot a squirrel from 50+ yards though. Hollow points plus this gun equals stay the fuck out of my vegetable garden.
I got an edgar bro's mod. 60 S, pretty powerful but i prefer my 6 ft cold steel blowgun, lethal hunting tips and completely silent!
Ive got some pump rifle that I keep under my bed. I don't use it anymore, but you could totally take out small game with it. Its got surprisingly good accuracy for a shitty bb gun
i shoot a Beeman series 500. model 1026, 550fps. i bought it on a whim and am only sort of pleased with it. its highly accurate despite the lower speed. but it has a heavy trigger pull with massive amounts of creep. and its loud for a spring gun.