I personally have never weighed bullets or brass! For tiny groups at long distances it MAY help! I enjoy shooting but not reloading. If you are not happy with your performance then change something you are doing. Weighing and sorting bullets and brass should tighten groups but I’m not sure it’s something that could be measured from day to day. Maybe I’ll try this for the upcoming nationals and if I shoot a small group then I will most likely keep doing it, if not, oh well !!