ND sharpshooter has the answer. You need to stay with around 160 gr to make the pistol shoot to the sights. If you'd like a bit more weight, you might up the weight to 170 gr max, but experiment with any weight heavier than 160 gr to see if you can get the speed high enough to print where the sights point. It isn't wise to have the pistol throwing them higher than where the sights point, which will happen if you can't get a heavier weight moving fast enough.