Looks like a primer may have burned thru or a poor fitting primer / primer pocket allowed hot flaming gas to get by and burn the bolt face.
Welcome to the club. I have 3 or 4 like that. Most are a little worse. Were the primer(s) made by Winchester?
The WLR primers were responsible for the semicircular burn marks in my bolt heads.
Clean it up with a piece of fine emery. Doesn't look too awfully bad.
PS - Are you sure it wasn't there when the rifle was purchased and you're just now noticing it?
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