Imo weight sorting is a waste of time,it has nothing to do with capacity. It can be fat here and skinny there,still weigh the same,smash it flat,still weigh the same. If your going to go threw the trouble then measure capacity not weight,
To answer your question its sorted by lot#
I use the nosler custom brass for my 300wm,great brass imo just dont see the point in weight sorting. Its just one more thing to add to there list to justify the price. Other thing I learned about this brass is some of it is made by Norma and some by Winchester,nosler won't say wich calibers are made by who. Just that some are Norma some win