Nope, not running brass cases in the 6.5 Creedmoor. I am running reformed 6.8X51 bi-metal military cases as the head stamp on the Stainless-steel head is 6.8X51 SIG. The 277 Furry has brass commerical cases at 60,000 psi or can also use bi-metal military 6.8X51mm rated at 80,000 psi. This is for my experimental purposes only. Fireformed a bunch of 6.5 Creedmoor with 140 gr RDF at over 3100 fps yesterday with a more readily available powder. I do not post pictures, and no load data ...none of this is recommended by the manufacturer, and would void warranties.I am confused. Are you talking about running brass cases up to 80K PSI, or modifying 277 Fury cases to shoot in a 6.5 CM rifle?
A picture of your experimental cases would be great.