I know its taboo in a white, but have you tried a saboted XTP bullet? I personally have never shot anything but lead conicals in my whites, but the 300gr. .452 XTP in a crushrib/smooth sabot should be a good shooter.
Knight Bloodlines or Lehigh Controlled Fracturing Bullets in your weight of choice...especially if you prefer not to track an animal after you shoot it and enjoy a lack of bloodshot meat.