DuPont made a "smokeless" BP sub before any of us were shooting. Did you ever wonder where it went or who bought DuPont's rights to those products?
In the 1940s and 1950s DuPont "Bulk Smokeless" powder for shotguns was commonplace. It was used volume for volume as a substitute for black powder in shotguns. Its use, label, and marketing make it obvious that it was a black powder substitute in the volume for volume sense, which Triple Se7en is not.
Alliant bought them eventually in the 1970s.