Is the brass sized? How does the throat of the case measure compared to the specs on a 9.3x72R chamber? You can coat the case with a sharpie to see if it is binding towards the mouth of the case or the base. Could it be chambered for a 57 mm case? The .360 2&1/4" or the European equivalent? I sold a British rifle chambered for the 2&7/16" round, I bet the continental guns had odd ball lengths too.

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