Go to either Hodgdon or Alliant websites and focus on low pressure loads. With the 12ga, there's no problem getting pressures around 7,000 psi, and quite a few options will give you even lower pressure. Just use standard American 2 3/4" hulls. The extra 1/4" won't hurt you as long as you stay within the parameters for which your gun was originally designed. Saves you all the trouble of trimming hulls, sometimes wads, etc. A lot of us have been doing it for years in older American, British, European etc doubles.
