As I posted on another site in response to that same question, I think there is something else involved, but .300 Win Mag can go up to 64k psi in factory loading (SAAMI max), well above the 50k or so of the German 7.9 or the American .30-'06. Still, as I said before, a good Model 98 should handle the .300 WM fine, so I suspect something else is involved.
Jim
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