I've heard of using a chunk of '06 Springfield barrel on a Luger before. The nominal groove diameter is 0.308 which is 0.003 undersized. But then many of the available bullets for the Luger, either in factory loads, or for handloading, are also undersized. So everybody goes home happy.
Comes down to know your barrel and use the appropriate bullet.
(Unspellable- your accidental double posting was deleted by me...John S. You could have edited the content, but only moderators can completely delete a post)
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