H322 is a little fast for these bullets, so the pressure will hit maximum before the velocity is up to what SS109 would do. But if you'll accept a little velocity reduction, they'll probably function the gun OK. I would just start with the Hodgdon starting load of 19.5 grains and slowly work up. If you are using the magnum number 41-type primer, it may raise pressure a bit, so starting with the bottom charge is important.
