Without a top locking lug or cross bolt, cartridge is somewhat restricted to lower velocity/ pressures. As much as I enjoy 45-70, I think a flatter shooting round is more appropriate for this type of gun. As Brian suggested, there's nothing wrong with the old timers like 30-40 (.30 US), .303 British or .300 Savage. For simplicity, I'd stick with the rimmed cartridges, but don't I wish that action could handle .375 FNE.
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