We too use a .22 to cull our birds. My husband will hang them upside down first to relax then so they don't move around. This seems to be the fastest way. The broomstick meathod scares me, and you need to be precise with the axe. Just our method. We also put a bucket under them to catch the blood as they bleed out. Or you could just dig a ditch under where you would hang them and then just burn the entire flock when you are done. I would burn them and not bury them. It will contaminate the soil and anything that may dig them up. And trust me, something will.