@Unclenick: Thanks for fixing my post. You're a good man.
@Shadow9mm: Unless your 11th Hornady edition is different from mine, it does not have data for the 100 grain CX. It has data for the GMX bullet. I think the two bullets are virtually identical, but I don't know how identical, and I don't know about the interchangeability of load data. Perhaps the original poster can ask when he calls Hornady.
If Hornady has data for the 100 CX in a 6.8 SPC, I'm pretty sure they will share it. Years ago I bought a Rem 700 classic chambered for .221 fireball, and Hornady sent me a large sheaf of unpublished .221 rifle data. The interesting part was that the information consisted of photo-copied lined tablet paper, with the load data hand written by their ballistics technician.