Hi Peter,,,
Me, Ed (Shadow) and quite a few other folks here hunt with both calibers and both calibers do just fine. I've taken many a squirrel, bunny, even woodchuck with my .177 cal rifles ,,,, and routinely do the same with my .22's
I will admit that I prefer to use my .22's for small game hunting, especially the larger tougher critters, but I also break out the .177's periodically and hunt with them as well and they both do a good job.
The key with any caliber is simply knowing your distance limit and of course shot placement. Those 2 considerations are paramount in any hunting situation.
As for your .22 rifle,,,,,, just wondering,,,, you say you haven't had much luck with it,,,, have you run any chrony tests on her?? Are you sure she's operating "up to speed" ?? It really doesn't take much to take down a bunny, provided you get a good shot, so if you're hitting bunnies with that .22 and they're just flinching and hopping off than I would think perhaps something is wrong with the rifle -- not you....
As for GTA hunters taking game with their .177's,,, just do a search of Ed (Shadow) hunts and you'll find plenty of critters he's taken down with one of his .177's (and his .22's). Matter of fact take a look at some of the "Albums" posted by GTA members (especially Shadows) ,,,, you'll really enjoy them.
Anyway,,,, let us know how you make out with those shooters. Also,,,, how bout postin some pics of those harvested bunnies ???? We love pics !!
Jeff