list of finest to coarsest powder?

The OP is referring to density. Sorry I'm not mush help either. All I know is that flake powders don't meter well at all through volumetric meters. Next time I buy powder, i'll look for something other than 700 or 800X. As if i'll have a choice. Ha!
 
Ramshot also lists the density of their powders. Lee perfect powder throws have a chart that includes most powders as well.
 
What you are asking isn't of any practical value, unless you are comparing powders of a burn rates that are suitable for the cartridge that you intend to load.
 
If all you do is employ published loads, I can't think of any situations where knowledge of powder density is critical. If you develop your own loads, it can be very useful. Case in point - you have a full case of a powder of a given relative burn rate and if more space was available, you could add more and still be at a safe pressure. You can find an alternate powder close in burn rate but more dense and try it as an alternate. I have done with this H50BMG and US869 as an example.
 
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