30.06 training round

Anybody know what the significance is of the round dot, not decimal point, following the head stamp F A 31. on a fluted cartridge. My keyboard does not have the proper character. Thanks

The dot on the FA 31 was used to indicate a different manufacturing process. 5-draw instead of 4-draw.
See Punnett 30-06 page 221.
Several other years with dots are know and most of them are quite common esp. on dummy rounds
please see below

René

fa29dot
fa31dot
fa38dot
FA39dot
f51dot

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Thanks Rene!