DT,
Not sure I understand your question. The intent of every shot fired at game should be a quick and certain death and should be shot at a vital area. In the field, we know that every shot doesn't always hit that intended spot. The perfect shot should always yield perfect results but again that doesn't always happen. I have seen bullets that were supposed to be reliable performers hit exactly where aimed yet the bullet didn't perform as advertised or expected. No explanation why they didn't perform, just that they didn't. Terminal ballistics is still a studied subject and every season we read on this forum and others where bullets don't perform as expected.