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Remington 700 bolt marks on breech

Clearance could be a mile when locked up, but the bolt handle may be sitting pretty far back allowing contact on an empty chamber.
The marks are a non-issue. As long as the bolt isn't touching the barrel while in battery with a round in the chamber, what ever happens when cycling empty or dry firing doesn’t matter.
To clarify. On an empty chamber, there’s two things that stop the bolt from going forward. The front of the bolt against breech end of the barrel or the bolt handle on the receiver.
Appreciate you for making this clear (y)