I know a lot of people speculated that PB was the powder Federal was using in their paper hulls back in the day.
it was quite the coincidence that PB was dropped right about the time Federal started partnering with Rio [Maxam] to have a lot of their shells made by them.
[they also stopped making the 12S-3 wad, but are supposedly making a 12s-5 wad now]
Federal is also using and selling Rio shot as their own.
I know Rio has a plant in the USA [Texas for sure and maybe another in the south east] and makes several of the federal promo type shells as well as a sister product with their own name on it.
now somehow Cheddite is involved with the whole thing since they own the Estate name brand and the yellow/red boxes they sell are made with Rio hulls and federal type primers
[copy of the federal top gun Hull] but better shot and better wad than the top gun uses.
however their white Box Estates are a straight up Cheddite hull [imported from France] their newer hulls use a smaller primer and we generally call them a type-2.
the 'type-1's' took a larger diameter Rio primer. [this is the hull-primer combination I was using to start this conversation]
Cheddite [from France] makes the Rio hulls for sale in Europe, and is the number one hull maker in the world.
I believe Winchester has/had a similar deal going with Nobel Sport, at least for the manufacture of some of it's components.
stupid global market is screwing up our shooting,,,, kind of,, some of the imported stuff is pretty damn good stuff and carry's a good price tag when you can find it.