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1914 A.H. Fox recommended loads, courtesy of Researcher



12g 1 1/8 oz. 3 Drams BULK Smokeless was 6000 - 8000 psi.
1 1/8 oz. 3 Dr. Eq. of DENSE (Ballistite [sic] & Infallible) Smokeless was 8,500 - 10,000 psi.

16g 1 oz. 2 1/2 Dr. BULK Smokeless (1165 fps) was about 7500 psi;
2 3/4 Dram (1220 fps) about 8500 psi.

20g (Period reported pressures vary significantly)
7/8 oz. 2 1/2 Dram BULK Smokeless was 8000-10,000 psi.
7/8 oz. 2 1/2 Dr. Eq. DENSE Smokeless was 11,000 - 12,500 psi.


Outdoor Life November 1923, “An American Super 12”
https://archive.org/details/sim_outdoor-life_1923-11_52_5/page/356/mode/2up
DuPont No. 93 (which became DuPont Oval)
Super-X 2 3/4” Field with 1 1/4 oz. and 40 grains powder No. 4 shot = 8,871 psi + 10-14% for piezo transducer numbers
Record 3” with 1 3/8 oz. shot and 42 grains powder = 10,080 psi + 10-14%

In a 1927 Western Cartridge Co. flyer “Super-X The Long Range Load” by Capt. Chas. Askins the 12g “Duck Load” (not specified but presumed to be 1 1/4 oz. Super-X “Field”) is described as 3 1/2 dram (38.5 gr. DuPont Oval Powder = 11 gr. / Dr. Eq.); at 1400 fps (at the muzzle rather than 3 feet), with a breech pressure of 3 3/4 tons or about 8,400 psi + 10-14%
3” Super-X “Record” with 1 3/8 oz. at MV 1400 fps with 4.25 tons = 9,520 psi + 10-14%