On the 270 Hornady RN at 2000 fps mv:

I'm sorry to say that I wasn't very thorough retrieving that 270 grain bullet from the bison. The entrance wound was pretty much a half-inch hole through the scapula and the bison, maybe a year and a half old and 400 pounds or so, dropped immediately at the shot and couldn't stand though it wasn't killed. Under the scapula the wound wasn't much larger and under the off-side scapula there was no evidence of a wound. It was a full broadside shot so the spine was maybe six to eight inches from the surface at most - I should have been more observant and persistent in digging out the bullet.

I can't complain about the result, a bison in the freezer, but if the shot had been placed through the lungs I doubt that it would have expanded and probably would have made for a long chase. I won't be using that bullet at that speed on game again.