I don't question that a new Ruger would be better than an old Spanish Mauser, but i am not sure that it "can take loads that would be the end of a Spanish Mauser". Those old Mausers are pretty tough and I have seen folks use some darned stiff loads in them.
Rugers are undoubtedly good rifles but not magic. I would say that any load that would be dangerous in the Mauser, would also be dangerous in about anything else, including the Ruger.
Jim
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