O.K., now I am curious. Could a variable in the one-shot-one-dead-squirrel equasion be the projectile itself?
For us pellet-gun-weilding hunters, what shape pellet were each of you using in your successful campaigns? Wadcutter, pointed, hollow point, extra-heavy (8 grain round nose, for instance), or something else?
I have had the misfortune of having to shoot a hapless squirrel dozens of times with the old Crosman 760 Powermaster, using wadcutters. I finally had to employ the services of a nearby cinderblock "fired" from about five feet. Gory but effective. (And not the dance you wish to be doing with sensitive neighbors around! "Don't mind me! I'm just mashing a squirrel for dinner! Want some?")
I haven't tried the colibris or the cb caps on game, yet. I've shot them at the range, only to look at my single six to see if it had malfunctioned because there was NO discernable recoil or report in that noisy environment!