I've taken a few with my synrod 25 using heavy kings at 40. It's very possible but you need to have a very accurate gun. The right shot placement makes the world but you won't have a very big window.
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I've hunted boar with bow and arrow and I can say they are one tough animal. Out of respect for an animal the size and toughness of a boar. I wouldn't even think about using a 22 caliber air rifle.
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That's a 175 pounder and a tuned .177 Hatsan Flashpup from a previous thread here: https://www.airgunnation.com/topic/tiny-bullet-huge-hog/
A field point arrow with perfect placement will kill any animal on the planet. Yet bow hunters don't even hunt small game with field points. I know many here will do as they please, but I hope other more reasonable members will wake up to damage being done by that.
Don't shoot larger game with small caliber air rifles. It's not ethical whatever anyone else wants to tell you or convince themselves of.