I started casting those this year with straight WW's. The weight was about correct as I recall. I lubed them with LLA, unsized. (they water dropped at .459) I settled on 41 grains of Reloder-7, though 39 or 40 grains would probably be just as accurate. When I got up to 43 and 45 grain loads, it just got uncomfortable to shoot. (We don't get long shots where we hunt and I have nothing to prove, therefore I'm no longer interested in hot loads) I didn't have a lot of time when I tested the loads, but the 41 grain loads were getting about 1.5" groups at 80 yards. (Off a shaky rest)
Would like to hear what groups you get if you use 39 and 40 grains of Reloder-7, I just have not gotten out to try those loads.
BTW, there was no visible leading, even with the hotter loads.