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Four bore or 4 bore is a black powder caliber of the 19th century, used for the hunting of large and potentially dangerous game animals. The specifications place this caliber between the larger 2 bore and the smaller 6 bore rifles. This caliber was the quintessential elephant gun caliber of the black powder safari rifles. [1]
The gauge (in American English or more commonly referred to as bore in British English) of a firearm is a unit of measurement used to express the inner diameter (bore diameter) and other necessary parameters to define in general a smoothbore barrel (compare to caliber, which defines a barrel with rifling and its cartridge).
The confusion occurs due to Baker's common reference to the projectile fired from the firearm weighing 'half a pound', which would if a round ball equate to a 2 bore by definition. However Baker himself never refers to this projectile being a round ball nor uses the term 2 bore in any of his writings, indicating this half pound shell was a ...
While modern firearms are generally referred to by the name of the cartridge the gun is chambered for, they are still categorized together based on bore diameter. [citation needed] For example, a firearm might be described as a "30 caliber rifle", which could accommodate any of a wide range of cartridges using a roughly 0.30 inches (7.6 mm) projectile; or as a "22 rimfire", referring to any ...
[2] Following the bore guns were the brass case "express" rounds, which incorporated black powder with modern ballistics by making relatively smaller projectiles go faster. The dangerous game projectiles were often hardened lead alloy. The .577 Black Powder Express was the go-to dangerous game caliber from the 1870s through 1900.
[4] English or French smoothbore flintlock shotgun with an engraved iron mounting An 1836 Lane & Reed flintlock smoothbore musket. Another smoothbore weapon in use today is the 37-mm riot gun , which fires less-lethal munitions like rubber bullets and teargas at short range at crowds, where a high degree of accuracy is not required.
When a dial bore gauge is set using a ring gauge, overall accuracy can be within 0.0001 inches or 0.00254 millimeter. [2] A dial bore gauge has a contact needle that is housed inside the head of the dial bore gauge. The needle is moved when measuring the bore and mechanically or electronically transfers that data to the dial or readout.
The bore axis of a firearm is the longitudinal axis through the geometric center of the gun barrel. In a rifled barrel, the projectile (bullet/ball, pellet or slug) will spin around the bore axis as it goes through the barrel. Boresighting is a process of placing one's line of sight down along the bore axis.