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I think it was just the proof test.

These weapons were imho regulated with the 100gr load of Cordite. Jeffery has always been afraid of overpressure of cartridges in tropical areas.

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That’s how I understand it as well.
120gr for proof and 100gr for regulation.

This, I imagine, is the early method and iirc, the later 600s had a proof and regulation charge of 100gr.
Perhaps only the the first few had a proof at 120grs.

Cal’s book should clear this up but I don’t have a copy.

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