Okay, wow isathar, way to clear things up. That was literally everything that I needed to start up work. I actually figured out how to alter the number of shots based on weapons using the perk, but altering it on a per-mod basis seems cumbersome. I'll have to experiment, but If anyone has any guesses on how to accomplish that, I'd love any input. And as far as the power-armor battery bit, it's not strictly necessary to make the ammunition function as a battery - just to make it display the percentage - so I'm not terribly worried about that. Considering that you can't actually choose which fusion cell/ammunition you use, I'm not terribly worried about that at this stage, although I have some hope that F4SE or something will come around and fix either or both of these problems. UPDATE: So far, the way I've found to make this work is to have the weapon mod add a keyword specific to the mod, or at least the ammo modification factor, and add a perk that recognizes that keyword and alters the value accordingly. This also seems super painful to do on a per-mod basis, so please provide any ideas if you have any.