I don't bother weighing charges for my Gold Cup. I just use the 0.5cc cup that came with the old Lee Loader kit and some Red Dot powder. The pistol functions fine with various bullet weights and accuracy is much more dependent on me than the variations in charge weight.

I would be much more worried about accidentally putting a double charge in a pistol case than a reduced charge. Many years ago, in my youth, I was firing some .38 wadcutter reloads and heard a dull "pop" instead of a satisfying boom. I had obviously loaded a bullet into an empty case, a recipe for potential disaster. [:@] My buddy screamed for me to cease fire, fearing a bullet had lodged in the barrel and I was going to fire another round and have the gun blow up. I did cease fire, but I had also seen the bullet exit the barrel and tumble into the dirt about twenty feet away. After verifying that the weapon was clear, I picked up that bullet and keep it as a reminder to pay attention to my work. Carelessness can get you hurt. Thank God the primer had enough powder to push the bullet out of the barrel. Thak God also that I didn't put a double charge in the case next to it, as a double charge of fast burning powder can cause the gun to blow up and injury to boot.