jwp475:
A bullet starts out spinning very fast when it leaves the muzzle of a rifle. Once it hits a medium like flesh and bone....it will start to deform and yaw.
As the bullet that hit your animal was not going into ballistic gellatin....it might be hard to say exactly what it did.
However, if you have ever seen slow motion photography of a bullet going into test medium....the bullet DOES tumble and deform and can be deflected up or down depending on what it encounters.
As liquid is not compressable....the large exit wound was likely caused by the acceleration of other mass inside of the animal with the force of the impact being spread across a wider area causing the large exit hole.
Call me crazy.
