Dean, It was my understanding that the chamber and forcing cone were cut separately from the rim recess. The original Parker tools cut the rim only, so going in with a modern tool would only just contact the original chamber when the rim portion of the tool had gone in sufficiently. The original Parker tool came with a go/no-go gauge. I am not planning on cutting the rim face, just the diameter. We're only talking about .0025" (.005 on the diameter)
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