Probably the biggest remaining non-factory possibility is whether the chamber was relined or not. You don't need to reline the entire barrel, if you want to keep the bore the same and just change the chambering it's possible to get just the chamber relined. Probably couldn't tell without removing the barrel?

I found a guy a couple years ago that would reline a 32 Win converted barrel chamber back to 32-40, for example.

Or.. get a letter and hope it lays this to rest by saying the ledger shows it was made in 30WCF or 30SAV.


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