Larry;
Do note that the mean proof pressure given by Mr Goddard for the 2 5/8" chambering was listed @ 13,700 (He did not put an actual unit on it). 13,700 would more closely relate to 950 BAR than 850, & recall this was stated to have been from the 1925 British Rules of Proof. 850 BAR would equate to about 12,300pounds or some 1400 lower than the 13,700 he gives. When looking at the numbers the "Only Logical" conclusion is that in preparing this article for the Army Ordnance Mr Goddard by some means converted the pressures to actual PSI & did not use LUP. Also note the article was printed in 1934 so the technology for the conversion did not have to actually exist in 1925.
