Check the Briançon forum, the question was asked a few months ago.
Airport bus to Torino Porta Nuova station aeroportoditorino.it/en/…bus_en.html - don't take the train into Turin, it goes to the wrong place. Then train to Oulx http://trenitalia.it/homepage_en.html (times not yet available online for after the timetable change on December 11). On Saturdays and Sundays there is also a much more expensive direct bus from the airport to Oulx Stazione FS which requires advance reservation http://www.cavourese.it/ though the times may well not suit.
Thanks - that's really appreciated
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