I still am new to reloading. I have reloaded about 1000 rounds of 9mm. I just recently got a scale to weigh the finished loads. I am finding that there is a variation of weights of the finished rounds. Curious I checked the powder wights and then the bullets. They were just about where I expected. The only variation was the brass. Since I have been shooting them and have had only one problem, one round did not get any power. Dummy me. As long as the weights are in a range that tells me they got powder am I ok or should I weigh each brass before reload? Thanks for your help. I have learned so much on THR.