223 caliber ammunition throughout the Fallout series, see. Does anyone know if there's someone in the game that'll give me the recipe for this custom ammo? Or if there's a schematic for it? I found the recipe for.44 mag custom through dialogue with a stranger but i want the 5.56 for my Marksman carbine and Ratslayer.įor an overview of 5.56mm ammunition throughout the Fallout series, see 5.56mm round.