Shotgun shells can be found in various places, often in drawers or tables, and sometimes hidden behind objects. It can also be found enclosed in large orange toolboxes. Unlike other ammunition, shotgun shells cannot be manufactured in any way. Enables the manufacture of shotgun ammunition that requires 1 gunpowder, 2 rusty debris and 1 chemical fluid for 3 bullets.
First, you'll have to find Broken Handgun and Broken Shotgun. Fortunately, the gun is relatively simple. Once you have placed the three dog heads on the door and arrived in the yard with Zoe's trailer, just go inside and look for it to be in bed. Pick it up and put it in your stash for later.