As far as I know, Nightforce is the only company making 2-piece 20MOA bases for a Savage. Nightforce is good stuff, but it's pricey.
You could cut out the center of a 1pc 20MOA picatinny base but the trick is that it would have to be a base for a long action (since your rifle is a long action). If you took a SA version and cut it apart the angles would end up being wrong when the ends were moved farther apart.
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