Thanks so much for that link, very interesting & informative. I did not know all these dates, but new that powder was sold under the Infallible name long after Dupont bought Laflin & Rand & in fact long after it became a part of Hercules.
Also I have finally learned the actual difference between Infallible & Unique. I had always felt there was some small difference, but didn't know just what. Seems their formulations are identical but Infallible is in the form of little round discs of .065" diam by .006" thick with Unique being the same .065" Diam but .008" thick. This would make the Infallible slightly faster burning due to more exposed surface area. This would also explain why it was better suited for a 3DE-1oz load in 12ga than was Unique. To put up this light load in the older paper case with card & filler wadding required a very heavy pressure be applied, around 100 lbs, to ensure adequate ignition. Bullseye it seems has the exact same composition but is in .038" x .003" disc so much faster burning.