i'v used both calibers. and now for me 22 has better stopping power. i noticed on fur and feather when shot with a 177 you get more fly 'n' die with pigeons ,crows ect and rabbits aswell either run on or can lay there lookin dead, but not be.. i shot a half dozen rabbits one night with a 177 hw80 all head shot's , all picked up and bagged, seemingly dead . got home emptied the bag 2 rabbits were still alive, although they were skull fecked and basically paralised. they were alive and breathing. i think a 22 cause more trauma, more broken bones, and more uuummp . and realy knock's the win