After looking for Burn Charts on powders I ran across this article on Chuck Hawks page.
In it he discusses Relative Quickness and give his calculation for various powders. I haven digested this and he has another article by the same author, Roberto Serino on the subject.
https://www.chuckhawks.com/powder_burning_speed.htm
Could be of interest to the CB crowd.
I was most interested in the RQ of 4198 and RL10x range of powders as I am experimenting with them, in .30 cals.