Why not post some closeup sharp focus pictures of the muzzle? This would let us determine if the barrel has been relined, and what caliber it likely is. As mentioned earlire, your barrel is marked for a 9mm Luger chamber and bore, but it could have been relined.
If a 9mm Luger round would not chamber it could mean it's a .30 Luger chamber, or that something is stuck in there as a result of firing .30 Luger ammo in a 9mm chamber.
Since we're several days on, and you're having difficulty with this I'd recommend getting in touch with a competent gunsmith and having them look over your Luger.
Your local friends and M1911 expert have not helped you to this point so I would seek someone else for this assistance.
Tom Heller (lugerdoc on this forum) is an expert Luger gunsmith and not located that far from you in Missouri.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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