This is a undated 300 H&H Magnum barrel from a Winchester Model 70 rifle.
Bluing and Metal - This barrel has some worn spots and a few minor scratches, but no major dings or other damage.
Bore - 9/10 - This barrel has an excellent bore with no throat wear but a few minor pits. Borescope verified.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE