I've been successfully printing A4 sized tabs on my Versant 80, using the pre-cut Xerox stock. Xerox don't make an A3 tab for some reason, and even though I got a few blanks cut by my supplier I've been able to get them to print. The size shouldn't be an issue because they're smaller than SRA3, but they jam each time, I assume because of the shape of it. There's no pre-set tab setting for A3 in the printer either which I assume is part of it.
Has anyone managed to successfully print A3 sized tabs? Seems an obvious gap in the market!