(The previously mentioned) Sherman Bell "Finding Out for Myself, Part VI, Smokeless vs Black", in Double Gun Journal - Summer 2002 page 19, is modern validation of the mid-1930s Dupont data - not that Dupont's laboratory data needs validation.
Sherman Bell's articles along with Tom Archer's research and prose combine to make the pricey DGJ a must have/must read.
Too bad John Brindle passed away so early as his written works in the early 1990s DGJ were pure gold also.