Location: The Capital Wasteland (Doctor Hoff)
Another Schematic you can buy from from one of the travelling merchants. Just wait outside of Megaton until Dr. Hoff shows up. He’s the one in a black business suit.
Location: Girdershade - Sierra Petrovita’s Home (Sierra Petrovita)
You’ll get this if you complete the “Nuka-Cola Challenge” quest by bringing Sierra 30 Quantums. Kinda funny how in order to get a Schematic that makes it more efficient to create Nuka-Grenades you need to give up 30 Quantums. Oh well…
Location: Cliffside Cavern, Yao Guai Caves
Find the Overlook Drive-In south of Fort Independence and west of Andale. Nearby will be a door to a “Raider Outpost”, and through there are the Yao Guai Caves. You can find the Schematic lying in the caves, by some dead bodies.