I don't understand: A factory round leaves the barrel at 2650 fps and hits 2 inches low at 100yards. My handloads leave the barrel at 2500 fps and hit 3 inches high. Both .303 British, 150 gr. SP Bullets out of an scoped Enfield No.4 Mark II. What am I missing here - should it not be the other way around with the lower velocity hitting the target lower ?