I just purchased some 8mm ammo at the gunshow today and the headstamp is unfamiliar to me. I will try to get a pic, but maybe this description will suffice.
Brass case, copper fmj, the primer has 3 stake marks, the headmark is 12 at 12 o'clock and 55 at 6 o'clock with a star at 3 and 9 oclock...