Moderator said:QuickLoad predicts it may be good for 2950fps with a 123gr Scenar with a 28" tube. Since the 6XC will drive the Tubb 115 to 3000 fps, I don't think 2950 is out of the question, given the larger bore diameter. I don't think the case has enough boiler room to drive the heavier,139-142gr) bullets, but I'm sure folks will try.