To make shotgun ammunition, you'll need shells and bullets that you can buy at any gun store. Then you can combine them with moonshine to create incendiary ammunition or you can do something like create explosive ammunition with the addition of animal fat. He says I have the recipe but I can't see it. Bullets give you increased range and accuracy compared to normal shells, but you'll need both if you want to craft additional types of shotgun ammunition.
A shotgun (also known as a disperser gun, or historically as a hunting part) is a long-barreled firearm designed to fire a straight-walled cartridge known as pellet, which usually discharges numerous small spherical sub-projectiles in the form of pellets called pellets, or sometimes a single solid projectile called a slug. Some shotgun shells are loaded with lead bullets instead of pellets.