I would recheck my figures for 9 grs of Unique giving 900 fps in a 44 special, perhaps you meant in a magnum case. My 44 Lipseys runs about 925 fps using the "Skeeter" load of 7.5 grs of Unique & the 250 Keith.
There has never been or ever will be a jacketed slug that will go where Ross Seyfried was taking those heat treated cast slugs.
Took this Montana whitetail last month using the 44 special & the above load, hit her twice as she ran past me at about 25 yds, both shots exited, one through the front shoulders & the other through the lungs, she ran maybe 30 yds. You can see both hits.

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Dick