I took another pic of the underside of the barrel in natural light and it seems to show the remains of a punch mark.
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Agreed on the bolt handle cut-out... I assume it was a DCM gun that was re-stocked back in the day.
I now have a rifle vice, bore laser and "Firearm Accurizing Torque Wrench" (The Fat Wrench) so I'll be taking a stab at re-installing the scope so that it lines up with the barrel. Iron sites are certainly more convenient.