I show two loads for the 44/40 Winchester from the Lyman 45th addition reloading handbook.

The test firearm used was a Colt SAA with a 7.5" barrel.

200gr Jacketed bullet;
starting load, 8gr Unique, 825fps.

Max load 11.1gr of Unique, 1125fps.

Since the 44/40 is a bottlenecked case, you might have problems with setback with higher loads locking up your revolver.