Not in the aerospace industry myself but did study engineering and thermodynamics/fluid mechanics and concur with the above statement. Drag isn't merely the result of cross-sectional area but also a result of a partial vacuum that forms behind the object as it travels. Hop, or backspin will change the characterstics of the vacuum behind the BB and thus the drag.
The obvious example is golf balls, which also exhibit backspin in flight and are dimpled to help the ball "pump" (for lack of a better word) the air around itself and reduce the vacuum.
At one point in golf's history a golf ball wi
