"May I ask why you are using Pyrodex instead of black?"
I started out using Pyrodex because I live in a province that doesn't have any blackpowder seasons, so the stores do not carry very much in the way of blackpowder loading. Just the time I started loading BP shells Pyrodex was the go to here for those who do shoot PB. Some hype about it burning cleaner, etc. but after using it for over 15yrs I don't think there is any advantage over PB. The stores here carry Pydodex but its much harder getting PB in the granular size wanted. And you have answered the question you ask,"Densities of black vary across granulations, manufacturers, and lots within makers and granulations." Inconsistent supply and stores changing manufacturers based on whats available means constantly changing your loading regime.
