On the 5.56 ladder this rung sits closer to explo than to plain rounds. Take HV's doubled powder, add raw sulfur on top, then cut the yield of each craft. A full stack comes to 1,600 sulfur, half of what a stack of explosive 5.56 costs, for a round that hurts people rather than walls.
So who crafts it? Mostly nobody. The blueprint sits at the Level 3 bench next to explosives, and scrap spent there should open raids first. Incendiary rounds out of crates are worth firing; the ones you craft are sulfur you took from a rocket.
If someone insists, craft a few mags at a time, never a stack. Each craft drains one batch of powder exactly, but the raw sulfur has to be set aside before the powder queue eats it. For everyday fights, plain 5.56 is the stack to keep.
Questions
Incendiary 5.56 Rifle Ammo ×10: how many resources?
Sulfur ×125, Charcoal ×150, Metal Fragments ×50.
Which workbench does Incendiary 5.56 Rifle Ammo need?
Workbench level 3.
How long does Incendiary 5.56 Rifle Ammo take to craft?
5 s for one, every step included.
How much scrap does researching Incendiary 5.56 Rifle Ammo take?