Thanks for the effort brother.
BTW that 13,000 psi by modern transducers would be about 14,500 psi - which is what U.S. doublegun makers used.

You had me confused on all the "semi-smokeless" verbiage until I found that's what our superiors on the Continent and Great Britain referred to what we American deplorables called "smokeless"

Was "Unique" the name of the Belgian Proof House powder? I couldn't find the powder used after Nitro proof powder was standardized c. 1898.

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