I bought 4 those machine gun bull barrels and 3 are still lying around.
I had 12 MN receivers and only one would clock with their consistent but wrong headed Mosin modification.
All those barrels got clocked the same, and it probably matches some master barrel somewhere in the hands of someone who thought that all MN receiver's clock the same like Rem700s. They don't. They are all random.
If a guy had a carbide 7.62x54R reamer that could set the barrel back until their clocking matches your clocking.
I could write on and on and post pictures, and someone would still want those barrels from me. Some guy with no carbide reamer and one receiver.
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Here is how you get a new MN barrel.
Get a quality American made barrel blank. Cut the threads, cut the shoulder, cut the bevel, cut the chamber, headspace without an extractor.
Lastly, cut the extractor relief cut.
If you screw up and cut the extractor relief cut first like Tennessee Guns, no worry, set the barrel back and start over. You don't have a UK-59 hardened chamber.
Machine gun barrel
Krieger sporting barrel