Try the Sierra 55g SPs. They're just about as tough as the 55g BT GKs, and will deliver nearly identical results.
My predator load in my 223 uses the Sierra 55g SPs at 2850 fps. This load will dump any predator out to 150-200 yards, and shoots surprizingly flat to boot. I used to load the 55g BT GKs which gave basically the same results on game, but after I tried the flat based version, I couldn't justify paying more for the BTs. Besides, the flat based version groups slightly better in my gun anyway.
Don't push either of the Sierra bullets faster than around 2900 fps or you'll start blowing holes in hides if the range is shorter than 75 yards.