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by North Country Gal » Tue Jan 14, 2020 11:09 am
BB specific guns, that is, guns that only shoot BBs, are smooth bored. There is no advantage to rifling when shooting BBs because the BBs don't engage the rifling. As for damage, this is direct from Crosman:
"In addition to some low powered guns that are designed to fire only BBs, some models such as the Crosman 760, 66, and 2100 are "dual ammo" guns that also fire pellets. These rifles function as repeaters with BBs, but can be used only as single shot rifles with pellets. Although BBs are much less expensive than pellets, they have some disadvantages. First, a steel BB can not be designed to fit tightly in the bore. As a result, accuracy of a particular rifle is not as good when shooting BBs as when pellets are used. Pellets are made of lead or a lead alloy so they are soft. They can be made to fit the bore by being swaged slightly as they are fired. Therefore, they fit the rifling better, and the result is better accuracy.
Another disadvantage of firing steel BBs in a rifled barrel is that the BBs do not engage the rifling but rather ride on top of the ridges. Prolonged use of BBs in a rifle barrel can cause the tops of the rifling ridges to be worn off because unlike a lead pellet, a BB is as hard as the rifle barrel itself. If this happens, the rifle probably will not shoot as accurately with pellets as before the abrasion occurred. BBs are best used in airguns with smooth bores."
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