Interesting data. FWIW when I worked up a load for the 145ELDX, the velocities were not at all linear so I'm assuming the pressures were not linear either? I had a velocity "plateau" that went from about 59 to 61 grains where the average velocity only changed 75fps or so. I settled on 60.0 of RL26 for 3136fps.

I am continually astounded at how quickly people make up their minds on little evidence or none at all.
Jack O'Connor