I've seen a sheep head deflect a 300BLK sub. Knocked it out cold before it woke up once we threw in in the ute tray and its throat was cut. Had a scar running along its skull where the bullet had grazed it. Id say no penetration is more due to the fact pigs skulls are shaped like a ramp (as well as being pretty solid).
In terms of other anecdotal incidents. Just like people I believe there are just animals that have more will to live than others but they die just the same they might just travel further.
If pigs are in anyway able to stop a bullet reaching the vitals from a broadside shot I would be happy to be proven wrong. I can tell you that 64 Grain Speer gold dots exit quite readily from pigs through both shoulders. The biggest boar I've shot had a 147 ELD Match exit the offside shoulder and thats a piddly weak match bullet.
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