I hunted in England with a BSA Airsporter in 22 the velocity on that air gun is about 750 fps and it will kill Rabbits and Squirrels as good or better than a 20 gauge shotgun. Buy a good Air gun Scope and quality pellets and 50yard shots will be a breeze. Pellets are much lighter than even .22 bullets and go much slower out of most air guns so they wont travel as far., but you still have to be very careful with them. Pellets are cheaper now and eAsier to find than .22 ammo. Have you considered the .22 rimfire BB or CB AMMO?