Pussers Rum Gunpowder Proof 54.5%ABVPussers Gunpowder Proof is a traditional Royal Navy style rum produced at original Admiralty strength and in accordance with the Admiraltys blending recipe last used when the Royal Navy discontinued its daily ration on 31 July 1970. Gunpowder Proof: Prior to the invention of the hydrometer, the Royal Navy ships Pusser shutdown claims of watering down sailors daily tots by dousing a bit of gunpowder in the rum and attempting to light. If the mixture