Now that is some good information. Well done.
I was around back then but I missed any and all polygonal rifling issues regarding S&W Revolvers. (Sometimes I read with just one eye open.) Is it the barrel or is it the forcing cone that is polygonal? If true, then first, the shooter will get better performance than from a traditional revolver; and secondly, wouldn't there be some kind of warning or disclamier about using cast bullets with a polygonal design? Something akin to the Glock Factory warnings about not using cast bullets in their barrels.
Did I just use that word in a discussion about Smith & Wesson Revolvers? Shame on me. Shame, shame shame.