My husband and I have butchered 100's of turkeys and a few chickens, we use a sharp axe and block of wood. First we slip a noose over the head so we can hold the neck still then DH holds the legs and I hold the noose while he chops the head off . Hold on to the bird until it finishes flapping or you could bruise the meat, then we hang it upside down so all the blood drains out. I've thought about using the cone method but chopping the head off seems like a quicker death because I'm worried I wouldn't cut deep enough for a quick death. That's my goal quick and painless.