If it were me, and I really had to have that load, I'd start with Hodgdon 700X data for 7/8 ounce in a Federal hull with the (Claybuster) AA20 wad. I'd use the new Claybuster 3/4 ounce AA-type wad and drop 3/4 ounce without changing anything else. The only sticking point is that it must be a Federal hull, not any other.
Of course, I'd never recommend anybody else do that.