Well, first of all the term referring to the cartridge length is "Head clearance" not headspace, but for now....
The SAAMI cartridge length spec for the 223 Rem is 1.466" - .007" or 1.459" min, 1.466" max. casehead to datum.
If in fact they are .008" short the "best practice" would be to form a false shoulder by necking up to the next caliber, 243 in this instance, then resize the neck just enough so they chamber with a slight crush fit. The same as how we formed 204 Ruger brass using 222 Rem mags. On the left is the 222 RM partially neck sized and the fireformed to the 204R. IIRC the shoulders were moved forward .050".
If it were my brass ...well, I would just........ ;D
Bill
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