Using cheap electronic scales (anything less than $ 1000) for sorting projectiles is a waste of time.
Have a look at the differences between a force restoration balance and a strain gauge type scale...
I have a little experiment for you.
Go ahead and weigh your projectiles. Label some bags carefully, and store the projectiles in them.
Come back an hour, or a day or a week later and weigh them again. See how much consistency you get...
Litz (Applied Ballistics) has done quite a bit of research on factors affecting accuracy, and you are better off:
1) buying projectiles that come from a manufacturer that has better quality control i.e. Berger
2) if you have the time and patience to sort projectiles, do it by bearing surface length.
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