He wrote that the range is basically arbitrary -- you could use 50-100 or 70-100. He did not give a reason for the 60-100, not that I could find in the book anyway.
"The most important thing is to apply the same set of standards to each contender."
There might be an "ideal" range to use but that would obviously require a lot of research. And the indexing range could be like a factor -- track and/or class specific. A LOT of research.
