So I've been trying to build up every settlement location I can to maximize artillery coverage. I have them all owned except Boston Airport, Bunker Hill, and Covenant. I have everything linked to Red Rocket by trade routes, but haven't quite finished the artillery, turns out these settlers want "food" and "water" and "shelter" instead.
But after I get all the artillery set up, what areas are left uncovered? I assume the Glowing Sea is out of range, but I'd like a more precise answer. Also, if one settlement has more than 1 artillery, or if my target is in range of multiple settlements, do I get more strikes on my target? I already know that I can't target more than one spot at a time, no matter how many guns in range.