Shotshell manufacturers are pretty stingy with their pressure specs although I have not tried to get any data from them recently. I am not sure it would mean much anyhow as their ooadings change as much as a woman changes shoes. Their specs can and does at least occasionally change from lot to lot. Twenty years ago we did a bunch of testing on factory loads after noticing patterning differences. We tested randomly over the course of a year and found pressure differences in the same advertised loading, i.e AA, STS etc., could vary by as much as 1400 psi. However, their reported velocities remained pretty constant. I would be very surprised if that were not the case today.
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