I’ve never heard of these before. Nor have I heard of a long-chambered trapdoor Springfield. I think it might be a 2.4 inch case.
I see it looks like RIA had a rifle:
https://www.rockislandauction.com/detail/60/1477/springfield-armory-us-1881-rifle-4580500
So, this would interchange with what in a Winchester Single-Shot?
November 7, 2015

I think a Single Shot or Sharps rifle would make more sense for this cartridge, a Single Shot or Sharps in 45-90 would make even more sense. Maybe that’s why this concept didn’t catch on.
Mike
steve004 said
I wonder if they would fit Chuck’s rifle? Maybe would have been what he’s been looking for?
I bet these are just modified 45-70’s. Or maybe a 45-90? If someone is interested I can ask my military expert friend. The 45 EX has a 3 1/4″ case and is 3 5/8″ OAL.
What I am working on is on the left and a 45-90 is on the right.
I think it has also been referred to as the, “2.4 inch Sharpshooter”.
Pulled this from a cartridge forum (credit to, “Ray”):
Back in the mid 1870s there was an interest within the Army to compete in formal competition with organizations such as the newly formed NRA. But the Congress was in no mood to appropriate money for such things as “target shooting”. So, under the cover of producing an experimental sniper or long range military rifle and cartridge, the Long Range Rifle and the Lengthened Chamber Cartridge were developed. But it didn’t last long because with less than 200 of the rifles having been made, the project was terminated. But, it did show that the regular 2″.1 case with a 500 grain bullet was just as accurate, and so the efforts weren’t completely in vain. By the mid 1880s the Army initiated a program of regular target practice for troops in the field and competition shooting was recognized as a legitimate military activity.
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