Ok, did another measurement - the case diameter directly in front of the groove .412". Yea, I do see the .407" on the HL page - if its any help at all, the 'Rim Diameter' dimension 'D' is .412" on my example also - shown as .417" in the diagram.
This ammo is reputed to feed and shoot well, but as I have yet to try it myself in my weapon, all bets are off! Goddess only knows the provenance of the brass.
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