Like most things (assuming we aren't making head shots), the bullet does the work and many bullets for the .223 can work well on hogs. I guess it depends on what you set out to accomplish.
I will suggest that there are few cartridges that will make a pig leak from two holes as readily as a 300 TSX in a 400 Whelen. Is it necessary, no, but you wont ever be faced with a long or difficult tracking job.
Truth be told, I've seen a better blood trail with a .224 compared to a 35 caliber rifle; the diff was bullets, and we're talking premo stuff.
IMO, good game bullets come before good cartridges...
