Picked up some shot 30-06 shells with odd headstamps. The first, R A 1941 300 Z, I believe was made for the British (because of the Z) by Remington Arms. Was this a contract for England, why the "special headstamp? The second, OJP 59 III, looks like Czech or Austrian by the "German type code". Why Military 30-06 for them in 1959? Comments?