I don't know if I got my spreadsheets off of my old computer that went tits up or not, but I tested 20 random pieces of Starline brass in 6.5CM, Grendel, and .223.
Base to shoulder datum, OAL, and primer pocket depth on virgin cases were all in the .003 ES and .001 SD range. H2O capacity was all within about .4gr ES and .1 SD.
Lapua tested better, but I'm perfectly happy to run Starline in most of my rifles... especially autoloaders.
Just watch the case capacity of Starline...it is significantly less than Lapua or LC in .223, and Lapua/Hornady in the Grendel. You'll run into pressure a full grain less than book max in a lot of cases.