http://library.centerofthewest.org/cdm/singleitem/collection/WRAC/id/8149/rec/107
It lists the following loads and pressures:
12g 2 3/4 Field 1 1/4 oz. shot presumed 1330 fps = 10,750 psi
12g 2 3/4 1 1/4 oz. 28 gr. Ballistite = 12,900 psi
12g 2 3/4 1 1/4 oz. 3 1/2 Drams DuPont Bulk = 10,000 psi
Pressures were measured by crushers (LUP - Lead Units Pressure) and modern piezoelectric transducer measurements would by 10 14% higher, meaning at or above the current SAAMI max. of 11,500 psi.
3 1/2 Dram Eq. of "Progressive Burning" DuPont Oval used in the Super-X loads with 1 1/4 oz. shot was about 9,400 psi + 10-14%
All of those loads would have substantial recoil.
Any 1 oz. at 1200 fps load would be a reasonable choice in your gun.
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