So...where published in any reloading manual is there reliable data that would allow the 7x57 to perform as it should perform in modern firearms like the CZ or Ruger?
The text in my Speer manual #13 states that their listed maximum loads for the 7x57 are only to be fired in modern firearms or Mauser 98s in good condition (their test rifle was a Ruger M77). They also say to NOT fire the maximum loads in Mauser 93s and 95s, and not to exceed the starting loads in those rifles. IIRC, it says the industry maximum pressure for the 7x57 is 46kCUP, whereas their maximum listed loads operate at a maximum of 50kCUP. Is this not modern loading data? The loads purported previously in this thread are WAY above the maximum loads in Speer #13. I may exceed Speer's maximum 7x57 loads a little bit in my modern Ruger rifles, but not to the level purported in this thread.
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