I could find SOME reference to this, but my search skills are less than stellar. I know there are propellants currently in production, sold under more than one name (HP38 = W231, etc), but aren't there also propellants that were DC’d by one company but reintroduced by another?
It seems like I remember W680 went away, but came back as AA1680.
I think W630 just WENT AWAY… I don’t think I’ve seen an analog to it, to this day.
Hodgdon HS-7 was d/c’d but I thought it was reintroduced as one of the W57_ powders.
I also want to say that W452AA was d/c’d by Winchester (or whomever), but reintroduced as another propellant, the designation of which eludes me (because I REALLY wish I could recall it, RIGHT NOW, Darn it!). Trap100, perhaps?
I don’t know about HS-7, but it seemed like Winchester/Olin/Whomever would introduce a surplus powder under a certain name, sell it until they exhaust the stockpile, then reintroduce it, manufactured to similar specs (W230 →W231?), or let someone else do it (W680 → AA1680?).
It makes me think that W572 is out as a user-friendly(er) W571/HS-7 with flash retardants and some other fiddles. I’m NOT engaging in “conspiracy theory”, I’m just trying to keep the darn powders straight, while trying to find an alternate propellant to Blue Dot or AA#7.