What ammo or was it a handload ??
Headscape okay ??
My first guess is too hot of a load or bad ammo.
2nd guess is a carbon ring and the ammo is okay.
How long since its been cleaned ?
With the current bolt problem you could have blown some crap into the lug area, but other than that I would not want to guess.
Since the bolt wont close you probably should have a gunsmith look at it.
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