That would depend on what your rifle likes to shoot. Which ever conical is most accurate would be the one I was using. Some to try besides powerbelts; Bull Shop conicals in 460 grain or 500 grain. Have him make them to match your rifle. No Excuses Conical in .503 diameter in 460 grain or 495 grain. Great Plains Conicals. Maxiball. Hydrocon Conicals. One of them should shoot well out of your rifle, but it is a matter of trial and error...