That 1909 is a large ring 98 Mauser. Mauser made them all to the same specs regardless of whether the caliber was 8x57js or an older, pre-98 caliber like 7x57 or 7.65x54, so (barring some flaw in the conversion) the idea that the gun is going to blow up with .30-'06 is a bit silly. I wouldn't worry about safety with .30-'06, but if the rifle has only been rechambered and not rebarrelled, accuracy could be a problem.
(In most cases, as with the Argentine contract, an older caliber was chosen by the purchaser because they had existing rifles in that caliber and had ammunition stocks or, in some cases, a factory set up to make that caliber. Mauser, of course, provided what the customer wanted.)
The horrible truth, though, is that the cost of making a milsurp rifle, even a good one, into the equivalent of a Remington 700 or Winchester 70 will almost certainly cost more that those excellent sporting rifles, unless you plan to do 75% of the work yourself.
Jim
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