Some states even consider single shot rifles firing metallic cartridges as being primitive weapons. Most states having primitive weapon hunting seasons will have a precise definition of a legal "primitive weapon." And it seems that every state will have its own specific definition.

Texas has a fairly broad definition of primitive weapons which allows most any type or kind of muzzle loading rifle or bow, including a crossbow, to be used in most parts of the state (with some specific restrictions in certain areas). In Texas, the operative term is "Muzzle Loading", not caliber or in-line or sidelock. If a rifle must be loaded from the muzzle, it is a Muzzle Loader and is legal. Many other states are not as liberal in their definitions.