I am getting 2935 FPS with 47 grains of H1000 under the new DTAC in my 6 Creed. This load is very slightly compressed and shot out of a 28" 1:7.5 Bartlein barrel. I just got done with a match and need to get my speed again. I only had 99 rounds on the barrel before the match, and there is a chance I may have gotten a little more speed after the last 70 rounds or so.
I don't know what the difference is case capacity is between the 6XC and 6CM, but I do know that David Tubb has stated that his load in the 6XC is 45 grains of H1000 under the DTAC for something over 3050 FPS.
-CJ97