Last year I shot a little yearling at about 30 yds, classic side standing behind the shoulder shot, with a 180 gr Rem. Corelokt PSP. I've used this bullet on many deer and it has performed just as needed. On this particular little deer, it just exploded - at least as far as I can tell. There was a huge injury on the entrance side - like the ribs separated from the skin with a large blood clot between the ribs and the skin. The hole itself wasn't huge, about the size of a normal exit wound, but not the pinprick of a normal entrance wound. Then the bullet passed through both lungs, just destroying them. Really - just turned both lungs and the heart into something you could hardly recognize. Then there was a large baseball size exit wound. As an aside, this poor thing ran about 20 yards before it hit a tree and fell over. ( I say "poor", but I do think it was running dead and not feeling pain or panic).

I can only attribute this to the short range of the shot and the soft pliant structure of the yearling's ribs causing the bullet to do things it normally wouldn't??

Two seconds later, I shot a second deer - an adult doe - closer in, a front on shot and she dropped and the bullet behaved as I would expect. So at an even shorter range, it didn't explode - I'm thinking the front structure of the closer, larger deer was more to the bullet's liking.