Some of the designs have been around for a while, but the manufacturers have gotten really good about engineering performance to velocity ranges and, of course, manufacturing technology gets better all the time. I haven?t followed hunting bullets much, because old designs work so well for deer, but with law enforcement/self defense ammo, there was a real turning point in performance with bonded (really bonded!)/barrier blind rounds. That?s why I went from a .45 to a .40 to a 9mm!