Another old myth that needs to be put to rest.The higher the velocity,the greater the expansion,the larger the wound,the more energy transmitted into the animal.The problem that can occur with too much velocity is that a bullet may come apart and not penetrate.If a bullet did not expand at all after being driven through an elk by a 7mm remmag,it would not have expanded at a lesser velocity.However,it is quite common for a partition to leave a small entrance hole,expand and shed it's front core,then exit leaving a very small exit hole.Animals shot with partitions often do not drop as quickly as animals shot with more rapidly expanding bullets.