I have never experienced bridging in my 28ga 9000. That said, the press came with cadmium plated drop tubes, but one of my 600 presses, a newer version than all my others, has a black plastic drop tube. Comparing that tube to the cad plated tubes in the 9000, they appear to be the same dimensions. Im sure you have a 600 in your stable, so if you have one with the plastic drop tube, try switching it out with the shot drop tube in the 9000 and see if you still have the bridging issue.
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