Bullseye was apparently available commercially from Laflin and Rand as early as 1898.
Du Pont bought out Laflin and Rand in 1902 and operated it as a subsidiary. In 1910 the Federal government brought an anti trust suit against Du Pont and forced it to spin off much of the Laflin and Rand business into two new companies -- Hercules and Atlas.
Hercules got Bullseye powder in the process, as Du Pont was busy developing its highly successful line of Military Rifle and Improved Military Rifle powders, and those were taking up most of its production capacity.
And yes, old powder samples are stored in distilled, deoxygenated water. Smokeless powder is water proof, and the water is largely non reactive.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.