Brent: 1892 standard service charges and pressures, which need an extra 10 - 14% for transducer numbers
https://books.google.com/books?id=inQCAAAAYAAJ&pg=PA296 ![[Linked Image from photos.smugmug.com]](https://photos.smugmug.com/Shotshells-and-pressures/Pressure-data/i-hh3TPRX/0/KNZRBqXLDt4bfqm7crCs62nv5cWZNGHwkfLPJKtc6/M/S%26P%2035%20%2012%20%20EnglishService%26ProofPressures-M.jpg)
A 1893 William Read & Sons, Boston advertisement for the W&C Scott & Son Monte Carlo B Hammerless Pigeon Gun
“Regulated for 45 to 48 grains (3 1/4 - 3 1/2 Dram) Schultze or similar Nitro powders, and 1 1/4 oz. Shot”
Under the 1896 Rules of Proof 12g 2 1/2” and 2 5/8” chambers (bore .710-.740) maximum service load was 3 1/4 Dram Eq. with 1 1/4 oz. shot. (1220 fps)
The 1904 Revision in
The Gun and Its Development, 1907
http://books.google.com/books?id=3HMCAAAAYAAJ&pg=PA280Supplementary Nitro Proof
12g 2 1/2” and 2 5/8” chamber for service load 1 1/8 oz.
12g Extra – 2 3/4” chamber for service load 1 1/4 oz.
In 1925, the 2 1/2” & 2 5/8” 12g maximum service load was reduced to 3 Dr. Eq. with 1 1/8 oz. shot with a mean pressure of 3 1/4 tons by LUP = 9,800 psi by Burrard’s conversion.
The 2 3/4” 12g max. service load was 3 3/8 Dr. Eq. with 1 1/4 oz. shot with a mean pressure of 3 1/2 tons = 10,640 psi by Burrard’s conversion.
