Steve, I've heard only one report on the 285gr. Hornady SP. It was not particularly good, finding the bullet was very soft. The shot was from a 9.3x62 at fairly close range, running shot hit the spine back a bit far and of course dumped the deer. The guy posted a picture and there was a crater where he hit the deer's spine, the bullet not going any further. That's not a very big bone, even though a 200 pound animal(Alberta). The total penetration perhaps 6".