COBUK,
Actually the wound you see is in fact the entry hole. I was shooting a Rocket Aerohead, Ultimate Steel 100gr. They are a small little broadhead, but they fly right out of my bow and have never had a problem with them. This shot actually never completely passed through the bull. The broadhead was just beneath the hide behind the opposite shoulder.
I've shot several antelope with these broadheads and have always had complete pass throughs. I only draw 63# on my hoyt vectrix.