I found a cartridge mixed in with my 303 British surplus that I just bought that is NOT 303
It is marked FNM (so Portugal or Mexico) and 66-13
So I am thinking 1966 lot 13?
It is milsup FMJ oh and bullet is magnetic but NOT casing…
I am not sure if this is .308 or 8mm or what…
Can anyone help me identify please?