Yes, this is all well & true, but Do Tell Me. when the British started marking their guns for the service load in tons they were proofed for what was the markings on the 2 5/8", 2 3/4" & 3" chambered guns. It surely wasn't anywhere near 4 tons, 4 3/4 tons & 5 tons. These numbers just do not correlate with the LUP pressures of the 1925 era. These guns would all have fallen into the 3 ton to 4 ton range Not 4 to 5 ton range.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra