Daryl i went back through the emails on it and all I can find is it was a 812 grain bullet at an assumed velocity of 1000fps. Rifle was a 12 Bore Paradox by Holland and Holland. I know he did a lot of research and played around with different alloys. His wife who shot the bull was doing a story on it but I have not as yet seen it. The bullet penetrated 52 inches which I found amazing.