I have this same mold and used it a few times, I found accuracy not overly great at longer distances but worked well enough up close.
I will not give my load but I used a load for 1 oz of shot.
I think I might be able to get a little better accuracy trying different loads but I do not have a large selection of powder around me.
I mostly use the lee slugs for use during a deer drive or a finishing shot if needed or when I do not want to shoot a $3.00 slug.