The name Infallible stayed long after Hercules took over the double base powders from DuPont. A Lyman loading handbook from 1950 lists Infallible for shotshells & Unique only in pistol, revolver & reduced rifle loads. It has always though been my understanding they were identical powders & the Lyman 55 powder measure charts list the same setting for both for identical weights.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra