I’d rather use a NW gun than an 11 pound rifle with double set triggers when running buffalo. Imagin trying to reload. Not trying to be argumentative; just saying crescent buttplates were in vogue and few makers deviated from them in the 1830s-1850s. Trying to reason why they suddenly became “necessary” or helpful is an exercise of the imagination.
The question was why two British rifles were converted to crescent plates. One was an expensive london rifle owned by Ruxton. According to the auction description, Brit visitors were intrigued by our crescent plates. Why? What use was happening in the US that was not happening in England?
Well for one, buffalo running. I think it was Palliser who said the trick while racing on a horse alongside buffalo was to carry roundballs in your mouth; dispense a random handful powder from a stash in your pocket; and not use a patch. Just spit a ball down the barrel, keep the muzzle up until the moment of shooting, and the spit will help hold the ball in place for an instant while you tip the rifle down and let fly.
I do not have a horse or buffalo so have not tried this. But Palliser fed an expedition doing it.
Set trigger not an issue if you use the front trigger only.
Impossible to know if a question about the evolution of rifle features is answerable if you do not try to find out.
I'm fascinated by the intense research on some minor curlicue embellishment appearing on two masters and one apprentice's rifles in a 20 year period in one PA county, while a radically different functional development like a crescent plate, appearing everywhere and virtually dictating how the rifle can be used, goes practically unquestioned.
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Most set triggers produce a very hard trigger pull when used unset. The geometry is wrong for a useable trigger pull.
Running Buffalo is a point and fire operation at maybe 5-15 feet. For those with the money this is an option
J&S Hawken 65-66 cal. Can’t imagine any other use for these. Captured rods, heavy ball. And at least 3 of Millers paintings show pistols used while horseback though I have not seen one involving buffalo. Loaded heavily a pistol with a 9-10” barrel at close range is ballistically similar to a rifle at 100 yards.
There are books/journals that mention shooting Buffalo from horseback with Colt Dragoon revolvers. But I suspect in the Fur Trade era the trade gun, used as Francis Parkman describes, was very common. Natives used arrows.