I guess I don't really have any intuition of what would happen in a twist barrel if the air were moving too quickly, but from a physical standpoint, it is kind of hard to get a sphere to "spiral" through the air. I'm no longer doubting that it is possible, but trying to grasp how.... Like I said earlier, one of the ways to make it spiral would be to somehow give the bb a changing spin on the bb, or something like a plane using its ailerons to give it spin and its rudder to give it a "spiral". It is possible that the "cushion" of air follows the bb forward, and if the air is spiraling, it might have a weird effect, but I'd imagine the air stops much earlier than the bb.
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