I have had several 12 gauges that miked at 740 bores.
All of these are documented competition guns and have 2 7/8" chambers.
These were 34" guns.
I have also had 34" guns that were close to 729 bores. (both 2 5/8 and 2 7/8" chambers). But these are not provenance comp guns like the others.
Dates were anywhere from 1915 to 1927.
Hope this helps.
PS check your wall thickness to make sure all is well.
So to answer your ? I say yes they were. I don't know if upon request or other. I am by no means an expert.
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