Spent some time trying to organize all this
Poudre T Pyroxylée Sans Fumé (introduced in 1899) was a 11.5 grains/dram = 34.5 grains = 3 Dr. Eq. powder
Poudre T was used by the Proof House starting in 1900, and was the only powder used for Nitro proof post-1914.
Standard 12g load for Poudre T was 2.2 grams = 34 grains = 3 Dr. Eq. with 1 1/8 oz. = 7,170 psi + 10 - 14%.
Maximum load was 2.6 grams = 40 grains = 3.48 Dr. Eq. with 1 1/4 oz shot at 620 Kg/mm2 = 8,818 psi + 10 - 14%
16g was 1.7 gm = 26.24 grains = 2 1/3 Dr. Eq. with 1 oz. to a maximum of 31 grains = 2.7 Dr. Eq. but I haven't found pressures
Poudre K2 was introduced in 1937 with lower pressures and was likely a Progressive Burning powder like DuPont Oval
