Roger O,
It is a great advantage to know a load that will "shoot" in the rifle. On the other hand, considering when the gun was made, it is not possible that any Sierra bullet was used in the original regulation. You can very well try to find a different load that will "shoot"( maybe at 100 meters), while having an acceptable load in your "back pocket".
Mike

Last edited by Der Ami; 12/31/18 03:44 PM.