It'll work fine for plinker loads, light loads, but is inappropriate for anything with horsepower. The XTP is a jacketed bullet. Just use your JHP data. Hard to find green dot listed for .44 mag, but you can use .44 special data. Speer's number 11 shows 5.7 grains pushing a 240 SWC (cast lead) to 753 fps. Same load behind a jacketed bullet shows 718 fps. As you can see, not your deer medicine, but would work for paper given proper sight adjustment.