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Originally Posted by Cross
I'm wondering if the US and British measured calibers by bore length, and the continental armies measured from muzzle to rear of breech, but this amounts to the same thing...
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Pretty much.
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If the US Army used bore length, why does a primary US Army document refer to the 75mm M3 as L40?
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Which document? If you're referring to this one:
It's referring to the
overall length of the gun, which would be very close to the length from the muzzle to breech face.