Well, it is possible that H4831 is alot faster now than the stuff I used, but I can't believe it is THAT much faster. I would try starting with the load you just used, and work up in half-grain increments until I reached a good accuracy level or pressures began to become obvious, but not too high!! I would be interested to hear how far you get before that happens. As a matter of interest, I have found that I can use Sierra Game Kings and Nosler Partition bullets with identical charges, and get very similar velocities and accuracy.....