Your Niedner barrel would have been made circa 1933. The .257 Roberts of today (and factory) is a little different than the originals made by custom gunmakers.
I never knew that...can you elaborate on that a bit since it pertains to this thread, (at least tangentially)?
When Remington introduced the .257-Roberts they changed the shoulder angle from what was used by Roberts. So, many of the early custom rifles in that caliber have a different chamber than a factory rifle.
Extra caution should always be used when working with a Niedner rifle that could have a tight chamber.
