My wife took 1 whitetail at 200 and another at 225 yards with the 150g bullets. She shot 2 nice fat does with the 125's at 75 and 125 yards. All where very quick kills. I took a nice buck at 175 yards with the 150g bullet and he dropped on the spot. Most of the whitetails I shoot are very close, because I still hunt with this rifle and shots beyond 50 yards are seldom. Some say you can push the speed a little in these rifles, and if you want to try go with H335 and the Winchester 150g pointed soft point, or 150g silver tip. You have to watch how pointed the bullets are because the really pointed bullets are too long for the clip. I tried the Nosler Balistic tip and found them too long. Using H335, I have pushed the 150's faster than I do now, but you have to watch for pressure, and brass life is shorter. I have not tried 748, and have not shot the 170g bullet for over 25 years, the 150's work so well why would I change. I do use a 175g bullet in my 8x57 though. Good luck and happy hunting.