Newton's and Springfield's threads are the same.
That worked both ways. My first Newton had a Springfield barrel screwed into it and was caliber .30-'06. I went to the trouble to have reamers made for the .256 Newton cartridge so I could return the rifle to the original Newton caliber. It shoots like a house afire.
My most recent Newton is a Model 1922, and the barrel, which I assume was .256 Newton, had been replaced with a .270 Winchester barrel by the Niedner Rifle Company. I assumed that the owner replaced it because production of factory ammunition had ceased and the "new" .270 came close to the .256's performance.

