Remington is 1.062 and 16 threads per inch. Savage small shank is 1.055 and 20 threads per inch. I wonder if you were sent a "Remage" barrel by mistake? Can you post a pic?
Edit: just re-read. If your nut went on then you definitely didn't get a Remage with 16 threads. I suspect someone plugged the wrong numbers in and you ended up with the correct threads but an oversized tenon. Does seem odd that the nut would go on though. Must be a sloppy one.
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