Im not positive off hand, but I don’t believe you’ll need to machine the magwell. I believe it was all accomplished via blocking the mag box. Have you pulled the barreled action from the stock? Although, if you want to run a magazine, I would certainly machine it just the bit to allow the Centerfeed AICS. Also, you won’t hear any debate with it being Small Shank either. Many, many people are running full magnums in the Small Shank. Even Savage did until awhile after the WSM cartridges were released. That’s when they started making the Large Shank. But even they were originally made in the Small Shank Actions.

No other obstacles.