Thanks for the video.
Don't own a Urethane ball (had a purple Angle at one time), but do have rubber and old plastic balls and lots of old reactive stuff.
I keep forgetting the word for what I'm really asking, but fortunately you provided it....Carry. I was really trying to ask whether there would be much difference in carry between an old plastic ball (circa 1982), an even older rubber ball (1977-79?), and between those and an old reactive ball from a few years ago (my Champions' Ultimate Weapon bought in 1997).
Am thinking the cores on the newer [but mild] reactives, and even some of the newer plastic/polyester balls, would be superior to the old stuff, but thought I had read something a few years ago that stated that the cores become much less a factor when the ball does not grip the lane as well.
Makes sense in a way, but don't really know.