As the title reads I'm contemplating culling some cockerels with a head shot. The reason for this method is the worst part of butchering is catching the bird and the flapping after the deed of course. The new spacious electric fence run wouldn't make for an easy capture. I could go out at 5 am and grab a cockerel or two and hold them in dog crate until ready to butcher but as this hasn't happened yet realize it's a bit of a pain. The thought of a head shot, chicken completely oblivious, at any time of day is really appealing to me. I can group 1" at 150ft with my .22 magnum air riffle so am not worried of a benched 100ft aim, pellet on pellet accuracy with group under 3/4". I do have questions as to if it's an instant kill or will it be alarming to the rest of the flock as the bird goes into convulsions. Anyone dispatch birds this way? Where is the exact aim point? Thinking it's 3/4" behind the eye.