Clean the metal, remove all old oil, wax, grease, solvent carrier, degrease it....
(including under the wood)
then oil and rub a bit see if the old finish doesn't return....
I've had guns stored in foam lined cases show discolored finishes, where the foam has, over time, "sucked" the oil off the metal, leaving the blue finish uneven to the eye.
Re-oiling restores it, or, has for me, so far, so try that and see..
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All else being equal (and it almost never is) bigger bullets tend to work better.
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