My last batch of 200 gr cast bullets I loaded at 9.0 grs of Unique (Lyman lists 8.6 to 9.6) I liked shooting them at that load, Fairly stout but not overwhelming at all.

The New Hornady Manuel lists their 200 gr bullet (which I think is a soft swagged) at 5.8 to 8.6 gr Unique. Based on that you should be fine with 7.0 grs but think 8.0 would give better performance and not a lot of recoil.

Hp 38/231 is going to give about the same FPS using just a tad less powder.

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Still Running Against the Wind