The bottom line is that every human being in the world, except for crazy cat, agrees that rifle rounds are lethal beyond 50&150 yards.


LOL..Lethal; sure, I've killed pigs with a .223. The problem is that sometimes they don't drop, they run off into the forest and I don't find them until they start to smell.
55gr soft points don't penetrate enough, and sometimes (3 times I can remember), they bounce off the skull. 64gr soft points weren't any better. 68gr hollow points deform (but don't fragment, even at 70yds with a 20" barrel) and penetrate about 8", so unless you clip the spinal cord, the pig doesn't go down. 55gr ball actually seems to have the best balance of penetration and expansion; it penetrates about 8" and then blows up, but still doesn't dump enough energy to reliably drop a 150lb pig.
FWIW, I once bounced a 7.62X39 (steel cased, steel jacketed) soft point from an SKS off a pigs skull and had her run off, apparently uninjured.