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1Victor30
Welcome to the forum!
If you are interested in accuracy, then you will sort your brass. While consistency has been mentioned, no one has explained the mechanics. There can be differences in the length of the cases from different headstamps. While this will have no effect on the 9mm overall length, a case length difference will result in variations in the final crimp. Ideally, the taper crimp die, for the 9mm round, will remove the case mouth expansion and perhaps apply about 0.001” crimp. If you set your crimp die up on a long case, then a shorter case may not be crimped enough. If the die is set up on a short case, then longer cases could be over crimped.
The second mechanic has to do with case capacity. Thicker brass will result in less case capacity and increased pressure and vice versa. Pressure changes velocity, velocity changes groups.
Sorting cases makes sense even if you are just interested in plinking ammo.
By sorting, you will save yourself some primers because you will separate out the WWC, FC and other mil crimped brass. Trying to seat a primer in mil crimped pockets often results in losing the primer. The mil crimped brass must have the crimp removed to facilitate reloading it.
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