As RWO stated, relining a high pressure rifle barrel is fraught with issues waiting to happen.
Relining an old 22 rimfire or an old 32 claiber blackpowder gun is relatively simple.
Relining a smokeless powder rifle that's supposed to contain an explosion that can develop 50,000 psi... nope, not me. If it's a shooter, just rebarrel it. If it's a collectors piece, hang it on the wall and look at it.
As for the Salerno method... yes, it happened. It was a WWI expedient to convert the existing stock of old black powder cartridge rifles to the new, then standard, 6.5 Carcano round. It worked in that it allowed the Italian government to put their stockpile of obsolete black powder 10.4x47mm Vetterli rifles into service with rear echelon troops who needed to be issued a rifle but were not expected to use them much, if at all. Even then, it was observed that a large number of the relining jobs had issues that made them unsuitable for front line service. The biggest benefit was that all Carcanos could be sent to the front lines while keeping the illusion that the REMFs were also well armed, which helped slow down trench raids during a critical time for the Italian government.