Thanks for the Sierra data. A friend had run a quickload search with my components and got max of 68.6 grains for 3056fps and 62152 PSI which seems like a lot of powder and not quite speedy, so not sure what gives... as said book velocities tend to be generous. Lyman has 66gr for 2933fps, though it is the Jacketed Failsafe not the GameKing
Is it worth going up SAFELY by more than 0.2gr per load? say in 0.5gr increments?
