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Sidelock
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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
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Miller from Klaus Neuschafers history of Laflin and Rand " Laflin and Rand developed there smokeless shotgun powder in 1898 and named it Infallible. In 1907 DuPont bought out Laflin and Rand and continued making Infallible until 1912 when the US Government caused DuPont to break up it's monopoly on the Powder companies and transferred rights to Infallible to Hercules Powder Company which continued to produce Infallible in canister grade until 1937 and beyond for ammunition manufacturers. At some point Hercules was also producing Infallible and marketing it as Unique.

If you are interested here is a link to the Laflin and Rand history: http://www.castpics.net/subsite2/GeneralReference/L&R-Smokeless.pdf

Last edited by TwiceBarrel; 08/18/16 01:45 AM.
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TwiceBarrel;
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.


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There are many low pressure loads with nitro powders. BP will burn through quicker, but they're only good for a couple of reloads anyways so use the BP if you like it better.

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