After reading this thread,(yes all of it), I would not use that powder for loading anything!
I've gone out on a limb in the past, loading wildcats with little or no data. But that was with powders of known history. Also loading for short barreled single shot pistols,(in rifle calibers), for handgun silhouette.
I just went to look at 3 alliant and Hercules powders I have in stock. Unique, blu-dot, and STEEL, all have very similar grain size and color,(of course the blu-dot is easily recognizable). The powder you have, capsize, is of unknown history, quality and quantity. For that matter, you don't even know for sure it is Alliant/Hercules powder.
If you live in the city, I would not pile it up and light it! Some liberal might call the cops/fire department, you'd play hell explaining it. While it does act like fertilizer, it takes a while to break the nitrogen down so it can be used by plants.