Craig, not a tested recipe but I've loaded the Claybuster 3/4oz wad in both 12 and 20ga in straight walled hulls (ie. Cheddite, Fiocchi, RST, etc.). I'd have no problem throwing 15-15.4gr Unique with the CB 1075-20 wad and your Rem209 primer. I see the pressure at 8000psi or less. Before I found 20/28 my go to powder was Unique and 4756. 20/28 gives a lower pressure at the same velocity and calls for one grain less.
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Wag more- Bark less.
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