the debate of .177 or .22 will go on for ever! people often go for .22 for 'stopping power' but since all airgunners should be taking headshots only i don't think this is neccasary. i'm a .177 guy because the .177 has a much flatter trajectory. basically this means, for example, if you have A) 2 identical rifles one being .177 and the other being .22 and B)you both have them zeroed at 30yrds (the pellet is hitting where you put the crosshairs at 30yrd). now you have a rabbit sitting 40yrds away from you BUT you think its 30 yrds away from you, you misjudge the range which i still do, then a .2