The .375 H&H Savages used a longer than standard magazine and action cut out. I believe these were also the same as the .458 Win Mag. Savage never made a lot of guns in these chamberings. The other offering was the Model 116 Safari Express.
I guess you could try a magnum spring & follower and maybe it will work.
You may need to do some fitting to your new stock to clear the bigger magazine.
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