Your Daddy had no clue how to process hog or was a sadistic fuck. In no way should they be squealing if you're scalding and removing skin cuz they should be fully dead and bled by then. First off a 22 isn't going to go through the head, it's just going to knock it unconscious so that you can bleed it. Their skulls are thick as hell. What you should do is shoot it at the back of the head towards the snout with a 22 wmr. This will pith the hog, or sever the spinal cord. This is an instant and humane death. Then you bleed, eviscerate, scald the skin with boiling water and scrape the hair off or just outright skin the hog.
I'm a butcher who works in a slaughterhouse. Pigs are lowered into the co2 chamber, and then raised up after a minute and they've passed out, then you poke their eyeball to ensure they're asleep. Wrap a chain around their hind leg and host them upright, you stick them in the throat on both sides and they bleed out, dying almost instantly, they gently swing around a corner, spraying the backsplash with remaining blood and then they go through a massive burner... A flamethrower of sorts. After the flamethrower they're lowered onto a table and the chain is removed and they're dunked into a massive vat of boiling water. They're hooked through the Achilles and hoisted back up... I could keep going but the point is, these hogs only squeal on their way into the gas chamber because they don't like being told what to do.
Good one...my point about the squealing is that sometimes the pig may look dead but peripheral nerve action gives them that last squeal. I grew up on a homestead where things may appear cruel but it was survival...most times though the kills were quick.
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