The Israelis converted mostly K.98k's to 7.62 NATO, a perfectly good conversion. They were priced reasonably when imported and many were "sporterized."
But many countries converted older Mausers to 7.62 NATO as well, for reserve use. Those rifles were originally in calibers like 7.65x54 and 7x57, cartridges in the 40k psi range. They are OK (barely) with milspec 7.62 NATO, but should not be fired with commercial .308 Winchester, which is a lot hotter.
Jim
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