I just noticed something in Handloader Magazine that I have not seen before... Jada Enterprises
http://www.jadaenterprise.comis marketing a big bore bullet which is hollow. The hole goes all the way through. The advantage, they say, is that it is capable of much higher velocities and greater distances. Which I have no doubt would be true... There would be some venturi effect which would accelerate the air passing through the inside of the bullet and out the rear, plus a 360 degree lift vector perpendicular to the path of flight... However, I am curious as to the performance on game. Clearly, if this bullet hit straight, stayed straight, and retained it's shape, a pass-through shot would literally create a cookie cutter type hole all the way through. But, I expect that if the bullet was even slightly canted, or canted upon impact, that it would either fold in on itself, or tear itself apart... My suspicion would be that a good, behind the shoulder shot (not a heavy bone shoulder hit) would probably be a good kill, even if it did fold up or fragment... It will be interesting to watch this bullet as product reviews come along...
