Based on the cow elk my son shot 2 years ago with a Barnes 250 using 90gr of 777 I would say you have little to worry about with 85gr of powder. He hit the elk at about 85 to 90 yards and had a complete pass through with full expansion and less than 5 yards of tracking (if you can call that tracking). The XTP will work fine also but is not as tough a bullet as the Barnes.