I did a search first but found nothing specific to the 6.8 SPC. My rifle is a Stag with 22.77 inch barrel. SSA brass, Hornady bras, Barnes 85, 95, grain bullets and SMK 115 OTM. I've been using primarily Rx10 based on advice from other forums. The 115 OTM act like they will produce 1" or better at 100 with some tweaking. I've been advised the 68 l"likes" the CCI 450 mag primer for better ballistics + accuracy and the CCI #41 primer also. I have and shoot the Speer 90 grain bullet with Rx7 and get close to an inch. I realize this isn't a long range target gun but more a light rifle for coyotes, other varmints and light deer, etc. I am however a bit anal about accuracy and like to squeeze all I can get out of any rifle I have. I think you all understand that.