Need Experts Help

[jmoore]

jmoore - explain "cord worn" please

The cord used for cleaning could abrade the chamber, throat, and/or commonly, the muzzle whilst being pulled through the barrel.

Oddly, my rifle seems to have no other damage in the bore, but I can't think of much else that would create this sort of "washed out" area in the chamber. If your rifle shoots fine, it's nothing to worry about.

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[Thunderbox]

The cord used for cleaning could abrade the chamber, throat, and/or commonly, the muzzle whilst being pulled through the barrel.

Oddly, my rifle seems to have no other damage in the bore, but I can't think of much else that would create this sort of "washed out" area in the chamber. If your rifle shoots fine, it's nothing to worry about.

Surely an indentation on the case indicates a raised lump in the chamber, whereas any sort of wear or pitting in the chamber would be the reverse?

[jmoore]

Surely an indentation on the case indicates a raised lump in the chamber, whereas any sort of wear or pitting in the chamber would be the reverse?

It looks like a lump to me! (And in my rifle it definitely is a lump on the case.)
If it actually is a depression, then there's something stuck to the chamber wall. Awfully smooth looking for a rust bump.