Searched Baikal 45-70 pressure . Says gun is rated 2200 bar which is 32000 psi . Trap door loads are 28000 psi which is ok for Baikal . Next step up is Marlin 1895, encore, ruger 1,browning 1885, 35000 psi = +p . As in Hornady or buffalo bore ammo.
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Gotcha, that's what the manual says, thought you might have seen something different. My old reloading manuals rate loads as trapdoor, marlin, and Ruger No. 1. Maybe I should buy new manuals.