Changes

 The caliber, or chambering, of a weapon, is the type of ammunition needed by a the weapon in order needs to fire it at all. In other words, a weapon can only fire ammunition of the listed caliber, with a few exceptions (e.g. a [[.357 Magnum]] revolver like the [[Colt Python]] can also accept [[.38 Special]]). Any exceptions to this rule are listed on the relevant individual weapon pages.