I don't know what kind of pressure that was. I can tell you that it's a good example of Blue Dot being inverse temp sensitive; this is a load I worked up a couple summers ago, and was about 0.5 gr less than what caused light smileys at that time.
The load was a 220gr WFN cast lead at 1.260" OAL, over 9.5gr Blue Dot and a PMC SP primer. Velocity was a bit over 1250 fps in my 6.6" barrel; in the warm weather it went over 1300 fps with no smileys. Odd.
I wouldn't work up towards this load with most 220gr bullets BTW, the one I'm using is designed for maximum case capacity, most aren't, especially the truncated cone and semi wadcutter designs.