Dean, we don't know, by measurement, what the chamber wall thickness is in the #1 frame ten gauge, #71767. However, this measurement can be calculated by knowing the pin separation and breech dimension of a #1 frame gun. The formula would be to know the breech dimension, subtracting the pin separation, dividing by two. Maybe another known dimension would be involved, but I think I gave us enough to calculate the wall thickness of the breech, at least at the outside.
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