I would try swapping the barrel off the santa fe, onto the o3a3, and check headspace.
You may get lucky.
If the headspace is too deep, you can set the barrel back one full turn,and re chamber.
But the rifle will be app.1/8 in shorter than original, but you wanted a shooter.
The santa fe,and nat ord guns are great for shooting cast bullets in, i use unique powder, and a gas check bullet, from 110 to 180 gr, depends on distance, and if you want a dedicated lead bullet shooter, the front sight will have to be filed down, as the rear sight will have to be all the way up to hit at 100 yds
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