I spent a lot of time getting my Blackhawk gun, only to find that it's weak against 4 of the 6 monster types. I don't expect it to be amazing at everything, but at least let it be good against the monsters that are weak to and neutral to the two damage types of the gun. Worked out this in manner the gun would still only be super effective to two type, do normal damage to two other monster type, and do less damage to the remaining two, just like any other weapon that does special damage.