I have some .50 Cal ammo (12.7x99) that I’m having problems identifying.
The links are similar to US M9, but each belt also has a starter tab which is finished with something akin to black gloss enamel paint.
The headstamp is:
12 o’clock position: 74-06
3 o’clock position: F
6 o’clock position: 12.7
9 o’clok position: MR (with the M over the R)
This stuff functions well in M2 BMGs, but about 3% of the cases show a split after use (about 1-1.5" long).
The primers are crimped in place (3 spots 120 degrees apart).
If anyone has an idea about this ammo, please let me know.