A shotgun bore that narrows toward the muzzle to prevent wide scattering associated with chance.
A gun with a narrowed bore close to the muzzle.
In a shotgun, a bore which can be tapered to a somewhat smaller diameter at a short length (usually 21/2 to 3 inches) to your backside associated with the muzzle, being prevent the fast dispersion of the shot.
A shotgun that is made out of these types of a bore.
A gun the bore that is slightly constricted nearby the muzzle.
To bore (a gun-barrel) such a fashion the diameter for the bore shall be a little less close to the muzzle than at some point straight back of it apart from the chamber, in order to focus the charge (of shot) whenever weapon is fired. Also choke.