Been playing around this winter with some light 9mm loads using Missouri Bullet 125 grain lead. So far my best have been 3.0 grains of 700X and 3.2 grains of Titegroup. The Titegroup load is actually under spec. from all the data I have found but seems to shoot well. I bought some Wolff springs for my XD tactical so the light loads will cycle the gun. Seems like the scientific approach never gets boring.