I cleaned and butchered a couple feral pigs (150-200 lbs) after Christmas. I was amazed at how thick and tough their hide is.
A solid tungsten 22 mag bullet earshot would be the only thing I would try of your listed options. I would want to be in a tree at the time I pulled out the slack. The sows are much better eating in my limited experience. Watch out for ticks (I bet I had thousands on my pigs.)
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