What I believe you are seeing when you pulled the PRC apart is a disc blend. I pulled 60 , 7 PRC apart and found the same thing you are probably seeing. Nobody will have that powder. And I seen 3 different discs sizes in that powder.Out of the spherical style powders, anyone that has used LRT, does it have the shape of discs ?
I can't remember ever seeing powder like that. And I have been involved in some type of reloading since I was a kid watching my granddad and dad.
Shotgun, muzzle loader, pistols and rifles.
I don't believe we will ever be able to get what manufacturers use. IMO.