Quote Originally Posted by Animal Cracker
Well once the rounds open up they reach maximum velocity. The .40SW opens up to around 70 Cal right before impact..the .45, a short distance round is more a knockdown round that replaced the .38 after the Boxer rebelion.
Hp's don't expand till they hit something that they can expand in, and even then if the load is not proper reliable expansion can be a problem. But contrary to the somewhat popular belief, they do not expand until they are in the target.