Powder Pressures At Different Parts of the Gunbarrel, 1895
https://books.google.com/books?id=inQCAAAAYAAJ&pg=PA32&dq Smokeless Powder Pressures
The choice of 32 grains of Ballistite is confusing, as 24 grains is the published load for a 3 Dram equivalent; 26 grains for 3 1/4 Dram.
Alfred Nobel's 'Ballistite' was introduced in 1887, patented in 1888, then Sporting Ballistite (for shotgun shells) was patented in 1889, but not released to the trade by Nobels Explosive Co. until 1895. The published summary of the Trial states Ballistite rather than Sporting Ballistite.
1 1/8 oz. #6 shot at 1220 fps
Using the estimated Lead Crusher Pressure (Cp) conversion to PSI (pound force per square inch) (Cp x 1.5) - .5 = TSI, TSI X 2240 = PSI
Note: Modern transducer psi measurements average about 10% higher than LUP
32 Gr Ballistite (1 1/8 oz. at 1232 fps = 3 Dram Equiv.)
Breech - 2.9 Tons per Square Inch (UK, Long) = 8624 psi
(2.9 x 1.5 = 4.35, 4.35 - .5 = 3.85 TSI, 3.85 x 2240 = 8624 psi)
2 1/2" - 2.2 Tons = 6272 psi
6 - 1.2 Tons = 3718 psi
12 - .81 Tons = 1602 psi
18 - .33 Tons
24 - .21 Tons
42 Gr Schultze 1 1/8 oz. at 1220
Breech - 1.69 Tons = 4558 psi
2 1/2 - 1.49 Tons = 3886 psi
6 - 1.36 Tons = 3450 psi
12 - .92 Tons = 1971 psi
18 - .55 Tons = 1178 psi
24 - .32 Tons