I am confused by the description of the contact/rub area. I have copied the photo and tried to put an arrow pointing to the middle of the contact area I think I see. My arrow looks more like a line but right side of the line is on the intended target. If this is correct I would rather see the lug make contact near the round portion of the bolt body for the highest possible strength. Since this bolt receiver combo is a little tight on the brass, I would be inclined the take the barrel off and worry a little metal off the receiver on the high spot. Then lap it with valve lapping compound and reassemble after a thorough cleaning. Any compound left in there will bite you with excessive wear in the future. This is assuming the new never used bolt is square, which I think is a safe assumption.

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