"Smokeless Shotgun Powders: Their Development, Composition and Ballistic Characteristics" by Wallace H Coxe, 1927
"All powders loaded to develop the same energy" (ie. the area underneath each curve)
Pressure is expressed in Long Tons. sq/ inch but it seems clear that
PSI X 2240 was used to calculate those values (+ 10-14% for modern transducer numbers)
Ballistite maximum pressure at 1” was 4.9 Long Tons = 10,976 psi
Schultze at 1 3/4” was 4.5 Long Tons = 10,080 psi
DuPont Bulk at 1 2/3” was 4.1 Long Tons = 9,184 psi
FFFg at 1 1/2” was 3.8 Long Tons = 8,512 psi
DuPont Oval at 2” was 3.5 Long Tons = 7,840 psi
Pressure-time curve comparing Red Dot and PB, from
http://www.claytargettesting.com/study2/Study2.3.pdf 
Alliant data for 1 1/8 @ 1200fps 12g
Alliant e3 - 17.2 grains = 10,950 psi
Red Dot - 18.3 gr = 10,300 psi
Green Dot - 21 gr = 8900 psi
Unique - 22 grains = 8900 psi
Green Dot and Unique pressure curves are indistinguishable.
See
http://www.shotgunworld.com/bbs/viewtopic.php?f=13&t=405370 
Pressure-distance curves are almost identical at about 2"
