With that much brass there may be some benefit to sorting it by headstamp - if you really get bored some rainy day. But I think any benefit is based on the thickness of the case walls. If the case walls are pretty much the same thickness I wouldn't bother sorting them for that reason.
Regards
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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