An important point made by Brindle based on this study. Note the pressures with both Schultze and "E.C." are lower than with Curtis & Harvey black powder
.......12.16.20
C.&H. No. 46,373..7,078..6,944
C.&H. No. 27,459..8,310..8,288
Bulk
Schultze..4,424..6,272..7,246
E.C.....3,685..6,171..8,322
Dense
Walsrode..9,363...10,741
S.S.....9,800...10,539
S.S. ("Smokeless Shot-gun" was abandoned because of the higher pressures)
Curtis & Harvey was "T.S." (treble strength) and NOT equivalent but No. 6 similar to Fg, No. 4 FFg, and No. 2 FFFg
A second study using Eleys Ordinary Case showed slightly different, but similar pressures.
"The pressures produced in the breechloader by black powder, as black powder was actually loaded at the end of the 19th century, were not significantly lower than those given by smokeless (then often termed semi-smokeless) powders developed as a substitute for, and an improvement on, black powder."
