20g pressures

Experiments by Mr. R.W.S. Griffith of the Schultze Powder Co. in Sporting Guns and Gunpowder
https://books.google.com/books?id=inQCAAAAYAAJ&pg=PA38&dq
Converted using Burrard's formula
7/8 oz.
66 gr. C&H T.S. No. 2 BP = 2.4 Drams = 8,300 psi
33 gr. "E.C." Bulk = 2.36 Dr. Eq. = 8,300 psi
22 gr. Dense Walsrode = 2.38 Dr. Eq. = 10,750 psi

William Bruette, Guncraft: Guns, Ammunition, Wing & Trap Shooting, 1912
https://books.google.com/books?id=5g51K93as84C&pg=PA210&dq
Converted using Burrard's formula
Amberite 2 1/2 case 2 1/3 Dr. Eq. 13/16 oz. = 11,648 psi
Curtis & Harveys Smokeless Diamond 2 1/2 case 2 1/3 Dr. Eq. 13/16 oz. = 12,320 psi

c. 1920 DuPont Ballistic Table on the 1st page
2 1/2 Dr. Eq. 7/8 oz = 12,655 + 10%
2 1/4 Dr. Eq. 3/4 oz. = 9,900 + 10%

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