This is a .300 H&H magnum bull barrel manufactured in 1954.
Bluing - 90% - The bluing on this barrel has begun to fade and is freckled throughout the piece.
Metal - This barrel is in very good overall condition. There are some scratches and pitting in spots, but no significant nicks or other forms of metal damage. There is a non-standard "494" stamp on the base of the barrel that was added by a previous owner.
Bore - 6/10 - The borescope shows rifling wear and pitting in some spots throughout the bore.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE