It's better than the 7mm08 - it's got more capacity. It you load the 7mm Mauser to modern pressures it beats the 7mm08 with 140's and then doubles down with longer heavier bullets too.
Due to the larger capacity, and longer throats on some of the 7mm Mausers, when I make loads for my 7x57's I start at the max loads for the 7mm08.
Zero check with my Remington Mountain rifle, a 139 grain bullet at slightly over 2900fps which is what a 7x57 should be doing...
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