45-70 Government cartridge, which fired a.
It was also given a tighter 1:22 rifling twist (producing a greater spin on the bullet than the Model 1868 was capable of) and the bore was changed to accept the smaller. The barrel of the Model 1873 was made of a low grade steel, rather than iron as the Model 1868 (and earlier Springfields, all the way back to the Model 1795 Musket) had used.
The Model 1868 would also form the basis of the Model 1873, although with several significant changes. Allin for the Springfield Model 1865 (named, occasionally, the "First Allin") and had been improved through the Model 1866 and Model 1868. This mechanism had originally been designed by Erskine S.
The Springfield Model 1873 used the heavily refined hinged breechblock mechanism, often referred to as the "Trapdoor" because of its hinge located ontop of the barrel which opens vertically.
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