I just purchased a Benjamin Sheridan Traill NP All Weather .22 non-pal, mainly for some problem squirrels I'm dealing with. They are persistently causing me problems by getting into the attic and wreaking havoc. I also have a few nuisance racoons, which I figured would be too big for this air gun to handle.

I haven't tried the gun out on anything yet (I just sighted it in last night) but I also don't want to shoot something, only to wound it and have it run around wounded for hours/days/weeks etc...

Does this gun have enough power and will it be contingent on a head shot only?