We are just about at the tail of this years broilers and have done one Great white turkey, we have used several methods trying to fond the best for us.
We did an assortment of different broilers, Red sex link males, Wyandotte, Americana, Buff Orphingtons, Black broilers, Barbed Rocks, 1 Cornish cross and 1 Great White turkey so far. The RIR and Turkens are being done today along with another turkey.
Cutting the juggler in a killing cone is a difficult technique for us to do, but using a killing cone keeps the mess down. The eyes stay open the longest this way so you know it's not all that quick.
Using a hatchet or axe on a stump is a lot easier, but is a lot messier. We had a lot of trouble with this method.
Using a Killing cone and meat cleaver to chop the head off, has the benefits of not being as messy, but with the some of the ease of chopping. Although the killing cone does take some abuse from the meat cleaver if your aim is off. the cone was made from scrap aluminum and we have a lot more of the aluminum to make more. We added several 2x4's below the one that the cone attached to so that there would me more area to hit.
The hardest part of this method is to get the Meat cleavers blade parallel to the wood when chopping.
I began to wonder if some sort of scissors would work. But it took a little, to think of something that would be large enough. I remembered that we had a pair of tree trimmers, I got them out, sharpened tightened them up a lot. These are the kind with two foot handles. One snip and a little tug and it was all over including the turkey. Not missed with a hatchet or meat cleaver, Wonder if the bird you have in the cone has a little tougher skin that require a harder cut. Not worried if your going to cut you self of the bird tries to move on you.
To stun the birds, we tried holding the broiler upside down to make them pass out, but for some it was taking to long, more then 15 second some were not stunned after about 2 minutes. We tried swinging the broiler in a big circle, this seamed to speed up the stunning for most some took a long time.
I suppose it would have been a lot easier for us if they were all the same breed of chickens as the scalding was a little different for each breed, some appeared to have thicker skin, some were hard to stun and get into the cone, some were really hard to pluck.
The Great White turkey did not pass out after being held upside down. But once we finally got it to the area we were processing the poultry it was docile. We did use a nylon rope to tie its wings down to help keep them from flapping. The last time we relocated the turkeys to larger pens one shredded the t-shirt I was wearing and added a couple of scar's to my motley collect of scars, so we don't pick up large turkeys.