Eldon:
This is a good question for Ruger. Why not ask them? But what you are probably "measuring" is an extended forcing cone. since your gauge is home-made, it might be best to get a Galazan gauge or a plug gauge from Brownells and try the same measurements.
In any case, there is no need for concern. Longer cones mean slightly less pressure.
Conversely, 2 1/2" chambers do not raise pressures significantly with 2 3/4" cartridges.
This is an endless topic of discussion. Bottom line: your guns are just fine.
Best, Kensal
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