A slightly delayed expansion and then explosion is how the Berger hunting bullets work; passthroughs aren't the objective.The objectiveis to cause as much damage to the organs in the animal as possible, which may mean something like 30% weight retention but massive trauma anyways. If you have a traditional hunting bullet, then sure the bullet can become a meatgrinder as its trajectory changes inside the cavity (when it doesn't exit). But also, if you maintain a wide hole all the way through the animal that is also effective. So basically as long as there is a big enough hole in the vital organs the animal will die