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There are special gauges, much like headspace gauges that check the forcing cone depth.
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Forcing cone depth does not control barrel cylinder gap.
Feeler gauges are used to assess barrel cylinder gap.
Revolver barrels have a flat area on the end of the barrel.
That controls the barrel cylinder gap.
The forcing cones largest diameter is always smaller then the OD of the barrel at the cylinder.
A thin edge here would quickly be eaten away.