Early 20th Century Powder Question?

[Mike of the Mountain]

I'm surprised Researcher hasn't added some input.

[Mike of the Mountain]

What I’ve found, which correlates to Phil’s post-


Parker Brothers used a variety of gunpowders for factory pattern testing, transitioning from black powder to early "bulk" smokeless powders around the turn of the 20th century. Key propellants identified in their testing and factory tags include DuPont Smokeless (often listed as DS or D.S.), "E.C.", and Schultze.