If you were to look I am sure you could find a M98 large ring Mauser that has already been converted into a hunting rifle. There have been thousands of them imported into the US over the years and I would bet that a large number have been modified in one way or the other.
FWIW, I have shot the 7X57 round for years and it is not a round that you need to hotrod. With modern bullets it will perform just fine at modest pressures. If you want a 7mm magnum, buy a rifle already chambered in that caliber.
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