Thanks Garth and Bill. It really looks like Alliant's 20/28 powder would be perfect for this. However, I have spent a week trying to find some 20/28(even on GunBroker with those soul crushing prices) without any luck.
It looks like I can use Unique and keep pressure in the mid to high 7000psi range for 3/4oz and the low 8000psi range for 7/8oz loads. With velocities for both in the 1100-1150fps range.
That will get me started since I have some Unique until 20/28 is available again. In my research I read where the burn rates on these two powders were close.
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