The gauges don't address throat length directly but a gun chambered with excess headspace will, by definition, also appear to have a long throat since the location of the rifling "moves" with the entire chamber.
You need to find a 'smith to get that chamber solid on the go-gauge and not closing on the no-go and THEN worry about OAL of your cartridges.
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Nobody plans to screw up their lives...
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