I may be wrong and correct me if i am but i think the Partition is designed to shed the front end of the bullet due to very rapid expansion with the remaining back of the bullet retaining it' s weight to drive the bullet through. I' ve killed a lot of deer with the Partition and regardless to what people say it doesn' t always pass through or at least for me that hasn' t always been the case. With a 30.06 and 25.06 i' ve recovered several partitions which were nicely mushroomed and several that had come apart. Let me add that i' ve had more pass through shots with the partition shooting deer then i have that were not pass throughs but i still get the same results whether it went completely through or not which is dead deer. The partition is without a doubt a good bullet and i would recommend it to anyone if they want to spend the money. I stopped using the partitions because i just don' t see the need to pay that kind of money for a bullet when i can get twice the quanity of a cheaper bullet (Hornady, Speer, Sierra) that kills just as dead for less money. This is just my opinion.