Gendoc asks the key question. Most ferral hogs - real ones, (not trapped and brought to a fenced enclosure!) are under 150 lbs and more still under 100 lbs. They aren't hard to kill....but they can take time figuring out they're dead! From a blind or a tree, go ahead and use a single shot from. 223 up, whatever you fancy. A good neck or ear shot and the hog is dead. But if you're walking up, I strongly counsel a repeater. They'll lie in a hollow, appear from nowhere six feet in front of you and charge. I shot a kamikaze piglet (45 lbs) in December with a 200 gr TSX 8mm 10' out and took a piece of head, some gray matter and a chunk of neck out of him and he still went six feet past me before he dropped dead. Same hunt, next fellow down the beating line was charged from 6 -8' by 130 lbs tusker, he just had time to get his rifle up and put a round literally right between the eyes on contact. That pig's brains came out its rectum, but momentum carried him into the shooter and cut his leg up through Carhart jeans for 10 stitches. Henceforth, walking up, I will carry a 12 ga semi with Brenekke slugs. All walking up shots I have ever had were under 50 yards.
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