you have metal cartridges like the world has carbon nanotubes
being able to use them for anything more than perhaps special revolvers and a rifle or two, in 1861, is ridiculous
considering many early metal cartridges were rimfire, thin and prone to malfunction, and a paper cartridge didnt need to be ejected and didnt malfunction a whole lot...
they're more of a novelty than anything, considering right now mass produced breech loading rifles are still fairly revolutionary, and they're still single fire
otto von bismarck makes a speech to the prussian chamber of deputies regarding prussia's future goals, saying "The great questions of the time will not be resolved by speeches and majority decisions—that was the great mistake of 1848 and 1849—but by iron and blood."