This is a really good thread. I don't have much to add, but patterns I've gotten with Polywad discs look just like Mike's. Bore constriction does not seem to matter. My .021 16 and .030 12 ga barrels throw cyl patterns with the Polywads discs.
My results with soda straw inserts are similar. Have not tried the Disperser X, but am intrigued by these - and by Rob's technique with Polywad discs.
Mike's ruminations about field choking are also spot-on.
I, too, would not not molest tight fixed chokes. It's easy enough to work around them.
Sam
