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This is a commercial rifle? Pretty sure no military 30-03 s made in the 30's. This was the original chambering of the US Springfield 1903 - it was a round nose bullet. Chambering was altered within a few years- 1906 ish to a spritzer bullet 30-06. Most 30-03 rifles were converted to the newer round.
If you have a Springfield 1903 - is highly likely chambered in 30-06.
If you have a Springfield 1903 - is highly likely chambered in 30-06.