Thought about that. Not SURE, but I think fixing that would mean replacing the barrel, presuming the seat is integral to the breach. The other side of your idea is “does the bolt fully close”?
Worth a real gunsmith’s opinion.
Replacement would be the fix is the chamber is reamed too deeply, as suggested by Vauquero in #15. Others have suggested a longer firing pin which was my first thought.
The other side of your idea is “does the bolt fully close”?
Possibly. Yours could be very slightly out-of-battery. Does the rifle fire at all? Does it never fire and just ding the primer?