Thanks for all the comments. I looked back through some saved articles and found this from Austin in the archives. I was familiar with the .750 overbore in the 1880's, but had forgotten there was a tendency to bore .730-.735 in the later years. Since there is no evidence this gun ever went back to the factory, I will conclude that the pristine .734 bores are original and just evidence of a well maintained gun. I think I am going to have to float the bird with that 2" drop.
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