The rules say the following about ammo:
The game does not have a granular system for tracking ammunition. If you have a gun, you probably have some ammo. But running out of ammo and going on runs to find more is an important part of the game’s world, so there are two thematically resonant ways that ammo scarcity can happen.
First, the GM could introduce it as a Challenge, for example by setting a scene where an NPC, who has counted the bullets in your storage, warns you that you are about to run out. Another way is as a result of messing up on a skill roll, for example when you roll for Ranged Combat.
How do GMs interpret the "messing up on a skill roll" suggestion above? Simply failing on the skill check is too frequent so do GMs rule that running out of ammo is when you roll a 1? Or as certain firearms have bonus dice associated with them is it only when you roll a certain number of 1s?
Or do some GMs track ammo in a granular fashion (as is done in Twilight 2000) as that builds suspense for the players as they start to run out?
Thanks for any input.