Primer ID?

I can’t remember if I asked this question before, but if I did I didn’t get an answer (or I forgot that too).

Cartridge is an FA 46, T-65, standard in every way except for the primer which has a large “0” or “O” stamped on it.

Any ideas??


The shape of the “0” and the nickeled cup is identical to primers that were sold by Remington, I believe for reloading. I have some .30 Luger caliber blanks, commercially made into blanks by companies other than Remington, with primers marked exactly the same way. I cannot say with certainty that this large rifle primer pictured is the same, but it sure looks the same.