British pressure and a soup sandwich

[Edward Horton]

Any British or Commonwealth mathematicians in the house.

What would the 19 ton British proof marking be in American PSI?

Is this long tons or short tons?

I’m asking because of what I saw below in the S.A.I.S manual and our American reloading manuals which in one states that our American Factory Ammunition is loaded to below 43,000 CUP (Copper Units Pressure) in deference to the older Enfield’s still being used and shot.

Did two different standard operating pressures exist or a change occur as below in British .303 ammunition and are my pressure figures correct, I used long ton figures.

In Skennertons “Australian SMLE Variations” I saw that the older Australian cordite .303 round was 19.07 t.s.i = 42,720 PSI ? and this was later increased for later Mk.VII rounds to 20.71 t.s.i = 46,390 PSI?

Would these pressures above equate to American reloading standards.

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