There is a gunsmith named "Redman" doing relining work on Mauser. People saying he does good job, consistently. Another guy doing similar work, some praised, some feedback saying he did not drill the new hole in the middle of the barrel. Probably unstable performance. No experience with either, but you may try "Redman". Fewer guys doing this business, I don't know he does Luger or not:
http://www.redmansrifling.com
The benefit of relining, it is still matching.
May contact Thor for the rest...