This is a .270 Winchester standard barrel from a Model 70 rifle produced between 1957 and 1963 as evidenced by the 17 striations on the front sight ramp (#7 ramp).
Bluing - 90% - The bluing on this barrel is generally dark but has several worn spots.
Metal - Overall, this barrel is in very good condition with some light scratches and freckling. There is no other significant metal damage.
Bore - 9/10 - The bore shows almost no wear in the throat and no notable pitting. Borescope verified.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE