My girlfriend's father has a hobby farm with American Bison and European Oxen. A friend of his wanted to shoot one of the buffalo with his 4 bore hammer double. They let him and the ballistics are worthless. There is no penetration with those bullets. One would think they could throw a baseball faster than that double. The bull was simply irritated because he had a bullet the size of my thumb sticking 3 inches beneath his skin. They had to back up and finish off the buffalo with shots from a 300 Win Mag. Those huge bores are definitely collector pieces but have no practical use.