I also think that could be a cool gun but not sure if that should be the new heavy shotgun type.
Perhaps increase heavy shotguns to 11 dmg, 3 clip and add a new "super-heavy shotgun" or Avenger-type with 2 clip 12 dmg.
That could work well.
But let's not ignore that 48.57% of the voters have voted for 10 dmg, 4 clip so far.