What powder is in Hornady SST factory load?

[v4lu3s]

I do not YET own a chronograph. GovX briefly had the Garmin unit for $539 but they removed it before I could purchase it. I am looking at a Magnetospeed from Guidefitter once it comes in stock though. I will take a loot at StaBall. I load 5 rifle calibers and would LOVE if I could find a powder that serves for more than 1 caliber but I think that is some really wishful thinking lol. I do roughly judge velocity by recoil on same weight bullets, and with the 123gr grndel loads i can feel very little which means to mea it is less than 5% likely diff in velocity (as comapred to to my 46 grain BL-C2 150 AND 165 grain loads, the 165 is notable sharper recoil).

I think you are really dead on though, without a chrono it is really hard to be "scientific"