No need to be confused. If you have an improved chamber 6.8 (SPCII, ARP, Noveski Mod 1, SAAMI II, etc), you can shoot any off the shelf 6.8 SPC ammo and safely handload a bit hotter.
If you have one of the few SAAMI chambers (Remington, LMT, Ruger) you can still shoot any factory 6.8 spc ammo.