NitroX,

I've seen this a couple of time on Buffalo.

Assuming you shot the Buffalo from the other side,
when it gets to the skin where it rests, the Expanded
bullet has alot of frontal area or if an FMJ, just normal profile
and not a great amount of velocity.

As the skin is extremely elastic it will expand out from the body
up to 1 ft and then spirng back. In the process the petals of the bullet
cut the skin and with all of the flexing it is turned sideways or the
direction it ends up is different to what it was travelling. The other thing
is that the petals can get caught as the bullet tries to get out / exit and
turns the bullet.

I have cut them out from under the skin various ways, some caused by
the above and some because once you move an animal the bullet can move.

The only way I can tell is when you cut the skin open to get the bullet it
is not as "tight" to the body as it is normally is as it has been stretched.

I was surpised when I first saw it and out of 100+ buffalo cut up it doesn't
seem to occur that often. I have also heard of it happening on deer.

500 Nitro