The bore is the inside diameter of the barrel.
Simply put, it's the hole down the middle of the barrel.
The word "caliber" refers to the diameter of the internal bore of a gun or firearm barrel.
Diameter of either the cartridge or the bore, dependent on how the measurements are taken.
In the US, rifled guns (handguns, rifles, machine guns, and cannons (artillery) caliber is measured from "lands to lands" (inside the bore); in Europe caliber is measured from the grooves. The lands are the raised portion of the inside steel barrel (inside the bore), the grooves are the cut portion, the valleys of the bore's interior. Therefore, a 20" gun would measure close to 20 inches directly across from one "land" to the other "land." If you measure from groove to groove, the diameter will be larger.
If they are intended for anti-personnel (that's killing people), they are the same size as rifle bullets. The US .50 round (half-inch bore diameter) was larger and developed after World War 1 for shooting down aircraft, but the Russians and British had even bigger machine guns than that. When the the bore diameter is 20mm or more, it is considered a cannon instead of a machine gun, even if it shoots faster.
the 700 nitro express is a beast the .700 nitro express or the 4 bore
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.
The word "caliber" refers to the diameter of the internal bore of a gun or firearm barrel.
What are you asking?
bore diameter
The bore refers to the hole in the gun barrel thru which the projectile (bullet) passes. Some guns have a smooth bore, but many modern guns, both pistols and especially rifles, have a rifled bore, that is, the bore has a helical (spiral) groove that causes the projectile to spin as it flies thru the air. The diameter of the gun's bore determines the size of the bullet or shell (e.g. .22, .45, 9mm, etc.)
The bore is the inside of the barrel- that is, the hole that the bullet is fired through. The diameter of the bore is measuring how wide the bore is from one side to another.
The range is not directly related to bore diameter. And the largest gun over built (The Tsar bombard) has a 36" bore.
It depends on the caliber of the bullet.
410
Bore describes the size of hole in something that has a hole as its main feature, e.g. a gun.
They are called riflings