Minimum wall thickness up in the front is one thing. And your pitting towards the front of the barrels looks workable. And if you are really running high 30s for thickness up there then that should not be a problem in having material to work with there. The more important thing is how much material there is back by the breech. And that is where the pitting looks worse. I like to measure thickness at the forend loop and also in front of the chambers. I like to see thickness of .050 plus at the loop and usually wall thickness will be .090" to .100" at the chamber front on most barrels.
At this point it is all speculation since only a hands on analysis of the thickness in the pitted areas as well as depth of pitting will need to be done on your barrels to know for sure.
By the looks of it, they likely can be saved. But it will be a lot of careful draw filing.
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B. Dudley
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