Just bought a mod 1867 Danish rolling block in what appears to be excel. cond. Have some brass on order. Anyone have any experience for a starting point? I'm thinking starting at the trapdoor springfield 45-70 pressures

I successfully used the Lee 405 Hollow base bullet and 45-70 brass. My loads were made up with 5744 using 45-70 data. CH dies were used. The grove diameter is .464. It's possible to use .45-70 brass to make up ammo. These old guns shoot well.