Video - The Palmetto Black Powder Tester in Action
 

I remember when Dixie Gun Works was selling this Palmetto black powder tester but don't remember ever seeing one in action before.
It would also seem to make a good black powder blank gun.
The last result with Swiss OB must be what we call Swiss Null B.
That's reputed to be floor sweepings, the leftover BP dust from making all of the other granulations.
The video lasts 1:50

Dixie still sells it for $185.--->>> https://www.dixiegunworks.com/index/...+POWDER+TESTER

That may be a nice little tool if you were going to make your own BP. Or like you said, a starter pistol.