I've only loaded jacketed bullets (Hornady XTP 240 grain) with 10 grains of Unique. Well, actually, I did load a few with 11 grains, but like the 10 better. I have been loading AA#9 lately, but have only used it with 240 hard cast (18.5 grains seems to be just right for me).

If you are going to get new powder, try 2400, H110 or AA 9 for full magnum. If you want to use what you have 10 grains of Unique should do well with what you want to do. If you want even more mild, go down to 7 grains of Unique. But I got a lot of suit in that low pressure loading.