The early Super-Fox doubles had bores of .750" but a bit later they settled into .738". Some later Savage-era Super-Fox doubles aren't overbored at all. From my checking of half a dozen or so Remington Model 31 TC barrels, they were overbored to .744", while regular Model 31 barrels seem to run true to gauge. My Remington hammerless doubles made in 1895 and 1896 have bores in the .741" to .744" range, while my Remington Hammerless Doubles made from 1905 to 1909 have bores pretty close to gauge. I find the Ithaca doubles in my accumulation seem to run overbored up thru 1934, then from 1935 on pretty true to gauge.
I've found some guns with quite tight bores. My 10-gauge Baker $100 Pigeon Gun sports bores of .753" and .752", my 12-gauge Royal Gun Co. single barrel Trap Gun .715", and my 12-gauge Fox Gun Co., Balto., Md., U.S.A. guns .708" .712" .710" and .713". Also, these two Baltimore Fox guns are the only two vintage doubles I've come across that are chambered for the 3 1/4 inch 12-gauge shells. I'd love to hear from others who have an example of these Fox Baltimore guns as to their bore diameters and chamber lengths. My four 12-gauge Frank A. Hollenbeck designed guns made in Baltimore by Ansley's old partners, after he ran off to be a professional shooter for Winchester all have bores very close to gauge and 2 3/4 inch chambers.
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