In the .45 caliber Green Mountain barrel I have on a Renegade stock 80 grains of T7 gave me a five shot average of 1792 fps under the 200 grain XTP. Ninety-five grains of Pyrodex P gave me and average of 1994 fps under the 180 grain Speer Gold Dot. Ninety-five grains of GOEX FFg dropped the 180 grain Speer's velocity down to 1745 fps.

So I think your velocity estimate is valid.

Here's a ballistic table for the .40/180 grain Speer at 1745 fps. As you can see, it's still moving along pretty well at 150 yards with sufficient energy for deer. I wouldn't hesitate to use your load for hunting.