How many pellets are fired from each kind of shotgun, and how does that relate to the displayed damage and damage reduction?
For instance, in the Borderlands series shotguns will often have a damage line something like "6 x 17", indicating that there are 6 pellets, each of which does 17 damage. I seem to recall a similar display in Fallout 3 and New Vegas, but can't corroborate that right now. In Fallout 4, the shotgun damage just says a single number. Neither the double-barreled shotgun nor the combat shotgun appear to be shooting slugs, so we're missing some information.
In most games, shotguns are poor against armored targets because they inflict many instances of small damage. In Fallout 4, is a target's damage reduction calculated against the total damage, or against each pellet individually?