Ideal Rockwell hardness of rifle bore

[Wombat of Doom]

This is a question that tumbles around in my head. I know that in the battle for metallurgical durability the hardness and the toughness must be considered. I was wondering if there is a general hardness that is the sweet spot in a rifle bore. Obviously too hard will lead to micro chips in the bore and too soft would lead to premature bore wear. I guess this isn't a post with a great deal of practical use, but it is what rattles around in my skull sometimes.

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[K-22]

This is a question that tumbles around in my head. I know that in the battle for metallurgical durability the hardness and the toughness must be considered. I was wondering if there is a general hardness that is the sweet spot in a rifle bore. Obviously too hard will lead to micro chips in the bore and too soft would lead to premature bore wear. I guess this isn't a post with a great deal of practical use, but it is what rattles around in my skull sometimes.

I do not know where today's barrels would fall on the Rockwell scale, but I had a friend, that was a machinist, and gunsmith, he had some WWII Japanese barrels he could not cut through with a hacksaw..
Best,
Gary