NE450, one interesting thing is that because the shots were high and I had a solid on the second barrel, there was almost no blood trail. This may be related to Water Buffalo who seem to bleed less as compared to cape buffalo (although I have very little experience with cape buffalo limited to a couple hunts in Zimbabwe).

Ben,
My heavy buffalo bow is a Robertson recurve, shooting 72# and heavy arrows (around 900 grains) and cut on contact broadheads such as grizzly and magnus. Almost all my shots were either pass trhoughs or at least punctured the far side.