I have seen a lot of this of late at our range with vtrious brands of rifles and factory ammo.'
No pattern to it at all exept my own speculation that things are running full tilt boogie with manufacturers using employees that are working far too many shifts, new employees that are inexperienced in QA/QC, and the whole ammo shortage/COVID related scenarios.
To date , I have seen ammo /rifle issues with Tikka, Savage, Browning,Bergara Defiance.
Ammo was 6.5 Creedmoor Hornady, federal 308 Win, annd some Winchester 7mm Mag.
More in the last 3 months than I have seen in more than 50 years !
If you get a combination of ammo on the larger side upper end of SAAMI specs, and a rifle on the tighter side of the lower end of the specs, you are in for a goat ropin'.
Cat
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Anytime I figure I've got this long range thing figured out, I just strap into the sling and irons and remind myself that I don't! 
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