As an F-Class shooter, my concern isn't so much with ~0.1 MOA precision, it's with culling those few bullets that are obviously defective, or that are gross outliers in some aspect. For that reason, I weigh bullets, but only to cull those that are obvious gross outliers. During the weighing process, I examine each bullet visually under a good light source, and by spinning in my fingers just as Matt described. In my hands, that seems to be sufficient to identify those with potential issues. If they're not too bad, they get used as foulers/sighters. Occasionally, you'll come across one that has deep folds on the nose, which also tend to be quite low in weight relative to the average. I've also found a few bullets by this process that had cracks in the jacket, or even what appeared to be an extra small fragment or layer of jacket stuck to the outside. It's pretty to "feel" these defects with your fingertips, making it easier to find and confirm them visually. I have yet to find a bullet that was obviously damaged due to packaging/shipment. That is not to say it can't happen, but my impression is that defects that arose during the manufacturing process are more common than those that might have happened during shipment.