Is there any data out there as to what pressure range would be appropriate??
You can find references, but it depends on calibre, projectile type, lube, and degree of fouling so we need a suitable measuring stick to experiment. I might see if my suspension luggage scale can be adapted.
https://www.amazon.com/Inspira-Digit...pt=WEIGH_SCALE
Lots of those that shoot better compressed do not get a steady, measured force but are hammered down, which is very hard to measure. Also, boom! (rarely but it has happened several times).