Read about it on Handloads.com and TheHighRoad.
In addition, Grafs, PV and Widener's are OOS.
Another thing is that Western completely changed the formulation of Nitro 100 and now labels it "Do not use in Handgun loads".
Seems they moved the manufacturing from Czech Republic to St.Marks and changed the powder from flake to ball...strange.
Can't confirm the Solo rumor but I can't dispel it either, that's why I'm asking.
Funny thing is, I was on the phone with their ballistics guy this week but hadn't heard the rumor yet.