BBs are .177 caliber. Pellets can be .177, .22, or larger. Pellet rifles are almost always rifled, not smoothbore. But rate of twist might indeed be an issue, depending on weight differences.
A forum community dedicated to Sport shooters, owners and enthusiasts. Come join the discussion about optics, hand casting bullets, hunting, gunsmithing, styles, reviews, accessories, classifieds, and more!