OK, when I think "entrance hole", I'm looking at the hole in the hide, from the outside of the deer, before you start skinning him. Likewise, I consider the exit wound as it appears before skinning. But, even with a rapidly expanding bullet, hitting rib on the way in, it's going to push the bone fragments in. Even with fast expansion andbone fragments the entry wound won't be 2" with a .30 caliber bullet.The bone fragments increase the exit, not the entrance. See my pics on p. 2 of this thread. That's with a 150 gr. power-point, which isn't one of the slowest of the controlled expansion bullets.