Bettin/Saturn does their machining/wrapping/contouring before rifling as well.Hmmm I wonder what kind of stress relieving they do after the boring/rifling process? As far as I know all barrels are stress relieves after boring or rifling, either by hammering, cryo, or heating. You'd think that heat(1100°) or hammer would damage the wrap. Maybe -300° cryo would suffice. I could be totally off base, but stress relieving is a MUST occur part of process after contouring before lapping.