As for those burn rate charts.............

I take all of them with a grain of salt.

No one powder will out do another in a 38, 9mm or 357 in all
my years of testing, do to another little factor.

The other chemicals that make up the powder and the amount of..........
Energy, that it gives it.

"Nitro" and other compounds play a big part on how a powder
moves the bullet down a barrel, either fast or slow but steady.

I just break them down into three "General speeds" of a fast powder,
medium burning or a slow powder which will usually take about 2x the amount of a fast powder,
in the manuals, depending on the loads.

Generally the fast powders work well with light target loads and
the slow powders for the high vel. loads but lately with the new
powders coming out, some medium burn powders are doing quite well
in the top fps area for me in my last 9mm test with the 135 and 147gr plated bullets.

I am just glad that powder and bullets are again out there for us............
Have fun.