I can only echo what Dean has said. The ONLY advantage of .22 is shooting rats or feral pigeon on farms where you can get a lot of "straight through" shots which can inflict a slow death & potential damage of farm buildings/roofs etc. I'm afraid it's .177 all the way for hft/bunnies/birds in tree's!
Rick Ardern. RIP mate, never ever forgotten!
Currently in stock........
Steyr LG100 x2, Ripley AR5S x3, hw77 x2, hw80 x2, hw100, hw97, hw98, Walther Dommie, Walther LGV, Stoeger x20s .22, Daystate mk4 in a custom laminate stock, Diana mod 50 + Gamo compact & Röhm twinmaster pistols