Fast forward a couple centuries and the 1888 Rules came on line but were soon antiquated due to the 1891/1893 German Proof Law, which forced the Belgians to raise the bar on their proof efforts in an attempt to meet the Germans pressures with a larger grain powder. Shipments of barrels were rejected by the Germans and the Belgians did not want to lose this monetary teat. So the Belgians took a Belgian Mauser and outfitted it with a crusher device to determine pressure. 3,15 grammes of this new devised propellant had to achieve a minimum pressure of 18k PSI breech pressure and the result was the stamp of the ELG surmounted by a Crown noting new Reinforced Proof to meet German Standards(Not Semi-Smokeless-Wood Powder).
Updates in the Belgian Proof Laws were typically due to changes in the Proof Law in other countries that imported Belgian wares.
Hochachtungsvoll,
Raimey
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