As Miller said, Progressive Smokeless (DuPont Oval) burns slightly slower than BP. Progressive Burning DuPont Improved Military Rifle (I.M.R.) Powders were introduced in 1914. DuPont Oval was developed for the 1922 introduction of Western Cartridge Companys 12g Super-X Field 2 3/4 1 1/4 oz. 3 3/4 Dram Equiv. shell.



The early Bulk and certainly Dense Smokeless did not



Modern dense; possibly Hodgdon Clays. Courtesy of http://www.arizonaammunition.net/



Shotgun Smokeless Powder DDT HAS been documented experimentally
http://www.trapshooters.com/threads/smokeless-powder-ddt.245629/

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