![]() I've heard people say that the 1873 design is capable of handling about 28,000 PSI or 25,000 CUP. The capacity of the trap-door design was never built with this in mind. Most of these powders can pack more energy into a smaller space and consequently it was possible to generate much higher pressures and velocities from 45-70 ammunition. That is, until smokeless powders became commonly available. The trapdoor style design was built to handle these pressures and no further thought was given to the matter. There was simply not enough room to get more black powder into the cartridge, so the design was self limiting as far as pressure was concerned. The 45-70, being developed for black powder, could pretty much be loaded by scooping the cartridge full of black powder and stuffing a bullet on top.
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