use to be 22 crazy as a kid bags were all ways small but taught me how to shoot with hold over an all that now im a fully paid up member of the 177 brigade an my bags are bigger lol accuracy over power any day... a think 22 an 25 would really be for the fac for the flatter tragectory but if like me you arent an fac holder then the 177 takes some batting.... not to say i havent racked em up with the 22 as i have an i must admit i learnt more from using 22 as you have to choose shots more an learn to shoot with more hold over on long range targets... i think all calibres have there place in hunt