You are correct. Above 0.800" is out of the 10/2 bore diameter range.
Five questions:
1. Where in the barrels are you measuring the bore diameter? It should be measured 9" or 15" from the breech. if you are too close to the breech you may still be in the forcing cone.
2. Are the barrels pitted. Putting in the bores could take a 10/2 bore into the 9-ga range.
3. Are the barrels shiny--if so, they could have been reamed out.
4. Do the bores have full length tapers. Parker did this on very early barrels, but is only know of a few and they all seem to have been made in the 1873-1876 time period.
5. Will a modern 10-ga shell fit in the chambers?
I have a bore gauge that goes above 0.850". If you will have your gun at the Southern, I would love to measure your bores and chambers.
Richard B. Hoover
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