I guess I go against the grain on this one. IMO, you should ALWAYS break-in a barrel, or at least the first 20 or so rounds, with the bullet seated INTO the lands. American made custom barrels have a higher sulfur content which makes them a little "softer" than others, like the Walther, which has a very low sulfur content. You can check with a smith on this but you can probably cut a chamber in about an hour using a Broughton, Shilen, Lilja, Hart, etc. It can take about 4x that amount of time to cut into the German made steel.
Having a bullet jump during initial shooting increases the risk of creating porosity at the intial rifling. You don't want to do that. Do yourself a favor and seat into the lands for break-in, or at least 20 rounds, then start backing off the lands for devepmnet.