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1. A shotgun bore that narrows toward the muzzle to prevent wide scattering of the shot.
2. A gun with a narrowed bore near the muzzle.
1. (Firearms, Gunnery, Ordnance & Artillery) a shotgun bore that becomes narrower towards the muzzle so that the shot is not scattered
2. (Firearms, Gunnery, Ordnance & Artillery) a shotgun having such a bore