This is a .300 H&H Magnum standard contour barrel from a 1954 Model 70 rifle.
Bluing - 95% - The bluing is dark and even. There is slight edge wear at the crown and on the front sight ramp.
Metal - This barrel has a few small scratches from contact with the stock, on the left side below the stamping, but no other significant marks of metal damage.
Bore - 9/10 - The bore has almost no wear and no pitting. Borescope verified.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE