Nice article/video.At the time the writer was using only 28 gauge 2 3/4 inch shells.It would be interesting to see the results using the 3 inch 28 gauge shell,that he said he was going to try later.
https://www.wildfowlmag.com/editorial/28gauge-shotgun-waterfowl-hunting/459781
https://www.wildfowlmag.com/editorial/28gauge-shotgun-waterfowl-hunting/459781