A caveat is in order here. We can match our load to pressures listed, but not to velocities. I've never achieved the velocities listed in a manual but when I get to the pressures limits allowable, I stop. I guess this opens the question if the velocities are suspect, are the pressures also in error? I think not; as we know, loads are shot in test barrels and although velocities may differ, the powder charges that generated those pressures and velocities are a constant.