What’s a hitscan? Alot of people using Blueprints could do with a glossary of Coder terminology 
You could cheat with the shotgun and check for enemies being inside an invisible, arched cone. Sort them by distance and then starting with the closest, roll a dice to see how many of a total amount of pellets hit them. You’d want to weigh it so that the closer to the shotgun they are, the more chance they have of being hit too.
You’d then need to do a few line checks after for impacts, based on how much buckshot didn’t hit anything.