Bill: the pressure (vertical axis) and time (horizontal axis) numbers are quite similar in these 3 graphs. Transpose the 3 Dram Black Powder curve over the other 2 graphs. It peaks about .75 millisecond.
Alliant e3, Red Dot, Green Dot & Unique all peak before .5 & obviously much higher pressures

Possibly Hodgdon Clays vs. BP



Red Dot and PB (no longer available). I think this was Neil Winston's work



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.



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