Ha, ha, ha... Welcome to the dark side
Unfortunately, 9mm and 12ga can't be done with the same press, though you could get into reloading fairly cheaply. In fact, if you are interested in a used Lee press, let me know I still have my old ones from before I upgraded to Dillon. As for loading the 12ga, there are a couple of routes you can go. Lee used to make a box set of "handtools" for reloading shotshells. In fact, I might have one of those lying around as well. I'll have to check.
I'll let you know!
-Nick
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Owner: Bennington Motorsports
www.benms.com
Sponsor for Midwest Region 944-SPEC racing series
-When was your timing belt changed or tensioned??
-Yes, I'm the crazy man that will loan out my 9201. Just PM me, I will add you to the list and get it out ASAP.