The bore of a gun relates to the diameter of the hole in the barrel - and in turn the diameter of the bullet the gun can fire.
get a bore attachment to a screw gun or drill.
Caliber "Caliber" is a word for the diameter of the bullet or the bore of the gun.
What are you asking?
It depends on the caliber of the bullet.
Bore describes the size of hole in something that has a hole as its main feature, e.g. a gun.
The range is not directly related to bore diameter. And the largest gun over built (The Tsar bombard) has a 36" bore.
Chamber or barrel.
They are called riflings