re: 17HMR or 22WMR for hogs?

Guy I hunt with traps hogs. He takes em out with a .22wmr using fmj’s. I asked why and he said it does less damage and flies through them. He let my oldest knock out 5 sows in one of his traps one day and he was right. My boys first shot was a perfect head shot broadside, bullet went through and smoked another one. I was pretty sold after witnessing it.