I believe Bro. Bruce has posted this c. 1900 hang tag several times, and it has been repeated that 12g guns were patterned with 1 1/8 oz. 3 Dram Eq.
Turns out that 40 grains of DuPont Bulk Smokeless is 3 1/4 Dram Eq.
For comparison, the 1933 edition of ”Smokeless Shotgun Powders” by Wallace Coxe and E.I. du Pont de Nemours & Co. reported the LUP pressure for 1 1/4 oz. 3 Dram Eq. of DuPont bulk smokeless at 9,600 psi.
A 1963 George Herter Reloaders Handbook (courtesy of Mark Ouellette) lists 23 grains (3 1/4 Eq.) of Infallible, now Unique Dense Smokeless, with 1 1/8 oz. shot in a paper case with paper wads (card & fiber) at 8,725 psi by LUP. By modern piezoelectric transducers that would be more like 9,500 psi.
And found this
http://www.bidsquare.com/l/917/parke...nd-2-hang-tags
16g SN 98546 c. 1899 patterned with 1 oz. and 30 grains DuPont Bulk Smokeless
12g SN 71792 c. 1891 patterned with 1 1/4 oz. and 42 grains DuPont likely Black Powder
Threaded Mode