Marc, as Frank has already said, the 8,82 indicates the bore diameter or the distance from the top of one land to the top of an opposing land. 8,82 converts to .347 inches. If each land is .004" deep and they oppose each other, that adds an extra .008" and makes it .355" which is the groove diameter. The diameter of jacketed 9mm Luger bullets is .355" so your bore is very close to having perfect dimentions. If your bore is in good condition, I wouldn't be surprised if it was very accurate.
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