Thanks for the reply.
I think what happened was that when Accurate bought out Scot powder, #9 and 4100 were so close, the former had better name recognition (due in part to the popularity of WC820 surplus) that the latter was ignored. This is just my own speculation.
Older Accurate guides list 4100 data for handguns. I have both the 2002 and 2003 guides (one of which is on Steve's pages), and there is data in those. I think Accurate publishes based on relative demand. For example, handgun loads with S1000 and XMP-5744 disappeared for a couple years, but are now back in the newest loading data.
Then there are the recommendations on this page, which unfortunately is hard to find because the website has some broken links.
http://www.accuratepowder.com/data/pistol4100.htmI was just wondering if there was some hidden negative about this powder, like "it leaves purple polka-dots on your gun's finish." If not, then I assume it's just because it is too close to the territory ruled by the undisputed King of Magnum Load Powders. I've switched over to "outdoor" loads for the summer, so I'd love to tinker with something that has the above advantages, and is a little easier on the wallet in the long run. Normally the only powder I'd ever consider buying in bulk is Unique, but I'd have no choice with this one. Just want to make sure I don't get stuck with four pounds of flower-bed fertilizer.
EDIT: For those of you interested in the load data, here are links to the two guides mentioned, one hosted by National Bullet, and the other on Stevespages.com:
http://www.nationalbullet.com/pdf/2002guide.pdfhttp://www.stevespages.com/pdf/2003guide.pdfI found these through Google. If it is not okay to link to them, I will remove the links and host my own copies somewhere else.