Too many variables to go wrong with building a load without rifle in hand. The first problem is what brass is being used , new or 1x. With sizing brass without the rifle could lead to tight closing bolt due to lack of shoulder bump. First thing I do with any new load is to work up a pressure...
Friday we started out at -30*F with windchills in the upper -50’s and got to -16*F for a high. Yesterday never made it above 0. Today we are at 2*F with a stiff breeze.
I ran into that with my 25 Creed. I was lucky that the case is the same length as the 6.5. Just used a 6.5 bushing die and got a 25 cal seating set for a 6.5 seater. You’re at a disadvantage as the 25 RPM case looks shorter.