Falling out of the box when it comes to 3rd-party mods, particularly when it comes to mods for games that you already own, is always frustrating. The fact that it happens to you often, and that it happens to you when you least expect it, is frustrating. When it comes to mods for games like The Fallout 4, it is essential that you find and install the correct mods for the game, and that you do so in the correct order. This is what I have done with the Gatling Laser ammo fix. I have taken the liberty of taking a look at how the game handles its ammunition source, and I have addressed the issue of not being able to use more than one core at a time. In addition, I have addressed the issue of having to use a lot of cores, and the way in which the game handles fusion cores.

The way this works is that whenever you equip a weapon that uses standard fusion cores, it'll apply a special weapon mod to convert it to use "partially depleted" fusion cores, and will convert standard fusion cores into partially depleted fusion cores as needed.