eldeguello,I have noticed that you also are interested in muzzle loader ballistics. We at the Saukinalks club did some interesting experaments back in the 70's. To make a long story short we found out that a round ball traveling over 1800 fps flattens out as it penatrates till it looks almost like a coin and then the edges are push or reformed back behind the center so it cuts a hole more like a round ball again. If you set up ballistic jell with card board partitions every 2 inchs then pull the partitions and keep them in order you can see all the shapes it goes through and why they are so effective. Lee