OP,
My precision 18" SS Krieger/CLE 1x7.7 AR15/M16 rifle is capable of 0.4-0.5 MOA with 5.56MM 77gr. SMK & 80gr. VLD loads in trigger pull conditions off a proper benchrest as long as I do my part. So I normally use virgin/never-primed LC brass for all hunting loads, load development, & short range loads. But for 80gr. VLD over-mag-length accuracy LR loads I use LAPUA brass. My reasoning is pretty simple: I don't feel I would gain anything with my rifle by neck turning LAPUA brass so no neck turning necessary IMO. And the consistency of LAPUA .223 brass helps get rid of the highs & lows in MV that show up as vertical stringing in LR groups. Match .223 LAPUA casing don't have nearly the weight variation I see in LC or WCC brass. Just so I could put a number on how consistent the .223 LAPUA brass actually was, I sat down and weighed (500) virgin MATCH .223 LAPUA casings. Total weight range was 93.5gr. to 94.2gr. indicating weight varied by a maximum of 0.7gr over all (500) with a little over (400) varying by only 0.4gr or less. The LAPUA .223 brass is also just a little bit thicker in the neck area which some shooters, myself included, feel gives more uniform neck tension. To put weight variation into perspective, I would fully expect (100) virgin LC casings weight to vary by 2.5gr. to 3.0gr., possibly a bit more with one or two casings which would be culled. The only chart I have seen on .223/5.56MM case capacity (below) indicates that, with very few exceptions, the normally seen .223/5.56MM casings just don't vary much. So many handloaders & commercial reloaders do not even sort brass by headstamp. I definitely think sorting by headstamp is a good idea for even my short range loads if for no other reason than shooter confidence. FWIW.
Edit: I should have mentioned that I kept the MATCH .223 LAPUA brass separated in (4) 0.1gr weight variation lots of 100 and used the "wide" 0.7gr. max. variation lot of 100 for load development. I could see no difference in my rifle as to what lot of LAPUA brass I used. So you can pretty well guess what happened with all that laboriously sorted-to-0.1gr LAPUA .223 brass once it was initially fired. If I were shooting a tight chamber BR rifle, yes I would have kept it separated in the 0.1gr. variation lots and then sorted by actual internal volume which is what you are really trying to accomplish. But not for use in a 0.4-0.5 MOA capable AR15/M16 IMO.
Some one put a lot of work into making this chart but I do not know who gets credit. IMO, similar charts in 308/30-06/300WM/etc. would be even more useful to handloaders.