11 calibers,
27 weapons.

What separates two weapons is often not the weapon. A round has its own damage, its own speed and its own behaviour against a plate, and two rifles sharing a caliber start from the same number. This is that starting number, for each of the 11 calibers a weapon in the game is chambered in.

The files declare more projectiles than this: tank rounds, rockets, arrows. They are not here because no weapon in the catalogue fires them, and a caliber page without a weapon behind it has no subject.