The 17 WSM has about 100 ft lbs more energy than the heavier 22 mag and the bullet design is more accurate, the question is penetration….. That said I have no time behind anything in 17 cal and know of multiple kills with 22 mag coyotes, gators, beef etc. I wonder if the rules would allow a muzzleloader hogs are tough critters I’ve shot one with a 30 carbine and not recovered it. Who ever made the rule is an idiot. 12 ga would definitely be a good option.