Brad, I agree with most everything you mention. We know that Parker rough turned the barrels tubes including the taper before assembly and that final striking was done after assembly. This would almost certainly make the bores not concentric with the OD.To bore a set of finished tubes the ID would have to be indicated in as you know and I would still be one nervous guy boring that deep.
You have a whole lot more experience fitting ribs than I do and I find it very educational that there would be that much material removed in that vicinity to fit ribs.
I learned something new today....thanks
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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