Several,well known ways to "sort". One very important ingredient is how quickly or,efficiently can you do it?
Throwing bullets on a digital scale is pretty quick and is an excellent way to monitor your overall casting technique. So while you may not have a rig that can tell the difference,that isn't the full measure of the procedure. At some point,better bullets are going to be needed..... so weighing is "one" gage to that end.
Visual ques to bases,and fillout sharpness in general is pretty durn quick. Rolling them(nekid bullets,after GC install)on an inclined flat plate isn't or shouldn't,take too long. "Gaging" them at this point slows down the process but can help diagnose poor casting techniques and establish baselines for mould quality.
A lot of this boils down to a cpl pretty important items. Short range or long range? Low velocity or high? What is the rig(gun/optics/rest/shooter) capable of? Are you pressing the envelope or not? Personal enjoyment vs work? Good luck with your project.