I've contacted Alliant powder through their website and I've always gotten a reply in fairly short order from Ben Amonette. He handles the questions submitted to the "ask the experts" button.
While this is through the Alliant powder site (merely an ATK holding) Ben's e-mail address is at ATK.com.
Ben.Amonette <at> ATK.COM
I'll bet you get a reply.
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.