Had a semi "real life" experience. A friend and I went hunting for wild pig on his farm. He had one magazine of "Powerball" ammo, and another magazine of "Speer Gold Dot" ammo. Three "Powerball" rounds didn't drop a 150lb boar. I managed to hit the pig with my Glock 23 (.40 S&W) loaded with 165gr "Speer Gold Dot" which dropped the pig. He changed magazines and shot another pig with 230gr .45 ACP Speer Gold Dot rounds. I think that one shot would have done it, but "Mr. Trigger Happy" double tapped the pig and dropped it.
If that's any indication, I'd say save your money and buy conventional HP ammo. We found 2 wounds on the boar shot with "Powerball" ammo on the head, and one round in just below the shoulder. The Gold Dot ammo penetrated the pig's skull.
Hope this answers your question.
gf