PET LOADS, by Ken Waters has a reprint of an article in HANDLOADER from September 1974. I'm sure Wolfe Publishing has it available. A lot depends on your bullet. For "group II" which the '92 & Hi-Wall would be, he recommends a Lyman 42798 cast bullet load at about 1420 fps with Herco as his "best cast bullet load at higher than normal velocities".
I don't want to give it out for fear of misleading users of weaker actions. Anyone can PM me if they wish to follow up.