GR8, there are many 98s that are though that aren't military, pre 1940 stuff. I would have no qualms barreling a VZ24 or FN military mauser to 375 Ruger. My very first 257 Bee was on a VZ24 and I had no issues with at all. The rugers peak pressures and pressure curves are a lot tamer than the 257 Bee.
Also a barrel maker makes barrels, he has no way of determining what action it is screwed on to or what reamer is run in to make a chamber. That is the gunsmiths call and the customer. Most barrel makers are gunsmiths as well but are not necessarily doing the work, quite likely just selling a contoured barrel, just as Douglas and Sheilen and Kreiger do.