If you want full power, you need to use a powder better suited to .44 Magnum power levels.
Unique is great for high mid-range loads, but it falls a couple three hundred FPS short of what you can get with 2400, H110, WW296 and other Magnum powders.
And you can't tell what you are getting by how it feels.
Both blast & recoil will be less because it is a faster burning powder then what you normally find in .44 Magnum loads.
Now, with all that said, Lyman #49 shows 12.0 grains Unique & the Speer 240 grain as a Max load giving 1,084 FPS at 38,700 CUP.
The same bullet with a Max load of 24.0 grains WW296 gives 1,292 FPS at only 38,500!
rc