Pete;
I note that Cox's original chart has 5 powders listed, while the Rifleman version shows only 4. As curve A in Cox's goes above 10K it obviously is the powder not listed in the Rifleman chart. Can you supply the name of that powder?
Note also that the black powder pressure is exactly 9K, while higher than most associate with black it does not reach 10K.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra