Considering you're planning on doing this with a standard tikka barrel and the person doing the work doesn't flute deeper or further into the chamber area, no difference to factory fluting. The many good NZ gunsmiths that flute tikka barrels wouldn't do so if it was dangerous. Local shop here goes so far as to honour tikkas warranty after mods. I would suggest there's more to the story of that other barrel failing than aftermarket fluting(unless was too deep on a thin barrel).
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