HANDLOADS FOR HI-POINT 40 S&W?

I just acquired a Hi-Point model "JC" 40 S&W. Wondered if anyone has best handload info for reliability/accuracy? Owner's manual states not to use cast bullets. WHY NOT? An article in "Shooting Times" found the 155 grain bullets to be the most accurate in the 40 S&W. Do you have a reliable recipe for this blow-back Pistol? Favorite powder & bullet style/weight to use. Thanks![8)]