F Guffey:
First you do not supply any context here? So what are you talking about?
ID or OD of the barrel?
If OD I would like to see measurements.
There is a difference between the myth thing that they just used 303 bore (they did not) vs what the outside diameter of the rifle barrel was.
I see no one saying the 303 bore was used in the 1917.
As the 276 cartridge was a modern high pressure round, the 303 was an easy conversion by a boring change from the Pattern 13 .276 caliber and the same was true of the 30-06 x 1917. Just a boring change.
While its possible barrel diameter was changed, I have yet to see solid data that says it was.
First you do not supply any context here? So what are you talking about?
ID or OD of the barrel?
If OD I would like to see measurements.
There is a difference between the myth thing that they just used 303 bore (they did not) vs what the outside diameter of the rifle barrel was.
I see no one saying the 303 bore was used in the 1917.
As the 276 cartridge was a modern high pressure round, the 303 was an easy conversion by a boring change from the Pattern 13 .276 caliber and the same was true of the 30-06 x 1917. Just a boring change.
While its possible barrel diameter was changed, I have yet to see solid data that says it was.

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