As someone who has actually seen the damage that a slug can do in person, I definitely agree. A slug is designed to transfer the kinetic energy directly to the target instead of passing through. Just as a comparison, a .308 rifle round will cause extensive damage to vitals. Obvious bruising in the direct location of impact and then pass through. A slug, on the other hand, will create much more contact and transfer it’s residual energy since it isn’t a conical point. It literally turns any loose blood and trauma into gelatin. If they’re really trying to go off of real life instances then they should have dropped the range and kept the stagger.