Mr. Murphy: You are correct.
As I mentioned earlier, this gun has been heavily honed (most-likely to clean-up "pitting" in the tubes). Less than 20-thou and I usually start to leave them alone (& that's dependant on where in the tubes the thin spots are, more towards the muzzles is much-less of an issue for me).
Chokes on this gun measure 0.033 and 0.029 "points" of constriction (from their nominal bore diameter) respectively, using a caliper-type of gauge.
The brass "drop-in" gauges are useful at gun shows for a quick assessment (& I have carried them there too) but proper gun shop tools are needed to assess the true nature of a set of doublegun tubes.
Only shops dealing in English doubles seem to be familiar with them.
The "honed" tubes combined with the No. 1 frame gets this circa-1887 gun closer to 7lbs (which is about my upland weight limit anyway, at least for the longer walks).
It's 93 outside here today, so in my mind this would be far easier to deal with...
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Very much looking forward to the approaching Fall.