Oh, by the way:

Have anyone of the .350Rigby user here in the forum loadingdatas and velocitydatas (with barrelllength) for 250 and 280grain buillets for the Rigby.
Best with Rottweil, Norma or Kemira/Vihtavuori-powder. American-powder is just Realoader RL and sometimes Hodgdon available; no DuPont IMR and no Win./Olin.

Thanks
Manolito