.223 vs 5.56 Hog Hunting

I have recently purchased a thermal scope for hog hunting at night. I have been using Night Vision/IR Light but the thermal is much better. I always felt like the hogs could see the IR light when I put it on them. So, I have that problem solved.

I have been using 5.56 FMJ 55grain while hunting these bastards. I have been wondering if the .223 is way to go. .223 is the only hunting round I can find (American Whitetail). Are .223's more accurate? Just trying to gain some more knowledge on them. Anyone know of a good 5.56 hunting round or should I switch to .223. I seem to be going back and forth in my research. Seeing what you all's opinion is. Thanks for the help!