Deep Creek Rock
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Have you noticed a big difference in accuracy based on case headstamp? To be honest, I've never paid much attention to headstamp. I worked up a bullet/primer/powder load combination but never worried about the case.
Ive always done all my cases that way. Depending on what load book source you use - they also recommend this.
Internal case capacity supposedly varies by make or even by Mil surp VS commercial. For normal plinking loads or for non precision offhand AR rounds, then maybe its non-issue.
In my rifles that are benched fired for smaller groups I do sort, to help keep things consistent.