![]() Tighter bores generally give higher velocities as well as better groups with traditional slug loads, while more generous, "back-bored" barrels are often preferred for target shotguns for their recoil-reducing properties. ![]() Furthermore, while the bore diameters of rifle barrels in a given caliber are usually consistent to within a half a thousandth or so, shotgun bores in a particular gauge may vary as much as. Since shotgun shells operate at far lower pressures than current high-intensity rifle cartridges, the walls of a shotgun barrel can be considerably thinner than those of a rifle barrel. There are some notable differences, however. Manufacturer:Hosford and Co.Except for the lack of rifling, smoothbore shotgun barrels are at least outwardly similar in many respects to rifle or handgun barrels. See Jon\'s gauge in use and learn how to use it on youtube by typing in a search on youtube:“Hosford
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