Man if that squirrel wanted to die it would deliver itself to a cat or snake. If his crippled ass has has lasted this long with kids with BB guns and other predators, let him live.
-Carlo
As much as I like to play devil's advocate: lots of "real outdoors-men" would let a venomous (which are not harmless) snake they see in their back yard live, but will blow the head off a squirrel (harmless) with a .22 "just for fun".
Back on subject: I am not a fan of snakes, but I also don't...
those guys are just morons. A .223 is very capable of taking down a boar, just watch the heli-hog hunting vidoes where a guy in a heli takes down hogs while moving in a heli...and maybe 3 shots and the hogs are out for the count in seconds.