Winchester 6.5 Creedmoor headstamp

In some recent bulk shooting ammo for the store, some Winchester 6.5 Creedmoor 125gr “Open-Tip Range” (I guess they aren’t quite willing to call it “Open-Tip Match”, which is an exercise in restraint by them) with what I thought was an odd abbreviation on the headstamp. I haven’t seen anyone else using the “CM” abbreviation like this yet.

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I have seen “6.5 CM” on a photo by itself. Turned out it was on a rifle (sorry, do not remember which one). I ridiculed it as someone not knowing the difference between 6.5 cm and 6.5 mm. Had to learn that cm in this context was intended to mean Creedmoor not centimeters.