There is a lengthy thread on Snipers Hide about it in the reloading depot. At least something to mull over. I did see where one guy mentioned that Dave Kiff of PTG said .130fb, others seem to have good luck with the .104fb. Just depends upon what bullet you are running. Beanland has my parts now for one, and I think his reamer is .104.....
http://www.scout.com/military/snipers-hide/forums/5533-reloading-depot/13229190-6mm-creedmoor
Thanks!