n working up and testing loads for a 2" gun I also learned quite a bit about fiber loading of shotshells. Also I came upon an interesting paragraph in the Chapter "Unraveling Rivelling" in the book Shotgun Technicana by Michael McIntosh and David Trevallion: "We also have a notion that rivelling is more likely to occur from cartridges with fiber wads than with polyethylene wads, simply because fiber is capable of setting up more friction than the slicker, smoother plastic.(This isn't to say you should avoid fiber wads, but we do recommend that you be extra diligent about keeping your bores clean if you shoot them.)
