Enormous damage

[Cyber8]

Hello, I have this really strange issue with damage on shotgun.
The shotgun is for some reason dealing too much damage. In the .def file, damage, velocity, mass, are pretty much equal on SSG.
Even with damage set to 0 it kills pinky with 2 projectiles hit. The SSG still takes few shots to kill with all projectiles.
Are there any other factors that affect damage on shotgun?
EDIT: I also replaced def and script with original ones and it still does that.