In Helix option 3 you can choose Slug or Pellet rounds. The choice you make should also apply to your Double Shotguns. If I choose Slug Rounds, I don’t want to be shooting a target from far away for 200 damage then have to run up 200 feet to do the same damage per shot with my Double Shotguns.
Note: The double barrel discharge should also be reflected in the Double Shotguns.