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== Firearm calibers ==
Firearm calibers are subdivided into three four informal categories: <span style="color:#0000AA">'''(P)'''</span>istol calibers, <span style="color:#AA0000">'''(R)'''</span>ifle calibers and , <span style="color:#00AA00">'''(S)'''</span>hotgun calibers. One firearm caliber belongs to none of them, and is referred to as a '''(Sp)'''ecial calibers. The vast majority fall into any of the first three categories; the '''(Sp)'''ecial calibercategory is reserved for very specific outliers.
Calibers listed below may also be sorted by base [[Pain]] damage (to give a rough idea of power), metric/imperial notation, [[Recoil]] value, and amount of compatible base [[weapons]] (including [[weapon accessory|accessories]]). The amount of base Pain provided for shotgun calibers is that of '''F-Slug''' projectiles. (see [[Ammunition#Shotgun caliber projectiles|this section]] for more details)
