Just got off the phone with Dober.... and basically I blame you all you guys for getting me into this.
I found a reamer in stock with PTG and that's on the way right now.
Talked to Redding earlier, and they had a full length die set, but it was claimed by another customer. Said they'd call me back if it wasn't actually sold.
Now that, I'm getting myself commited, I still need some sort of dies. I believe, and correct me if I'm wrong here (and it sounds like a call to the 'smith is in order), I can just use that reamer in a $25 die blank to at least build a full length sizer die, and get away with a backed off seater for the time being.
From an earlier post, it sounded like people managed to survive shooting 7mm Rem Mag brass in a Mashburn chamber, but I'm not sold on that idea yet.