I've killed train-car loads with my Mini-14. Mostly using 64 gr. Winchester Power Points. Some with 70 gr. Speer semi-spitzers. Several with Rem. 55 gr. soft points. A few with 55 gr. FMJ's, when that is what happened to be in the mag at the time.
I have shot and lost exactly ONE hog that I shot with any of my .223's. I did have one other shot with a .223 run - about 10 yards. All others fell DRT.
The only other hog I ever had that did anything other than quiver was shot with a Marlin bolt action......chambered in .17 HMR.....shooting 17 gr. polymer tipped varmint/squirrel bullet. I forget which brand. Porky jumped, ran about 30 yards and tipped over. Young boar, about 140 lbs. Turns out that the bullet had penetrated the hide, shield and chest. Completely jellied both lungs. Fragments found on the far shoulder.
In my pretty extensive experience, I have not found a properly shot hog any tougher than the average small whitetail. Maybe a bit less so.