The only .300 Magnum that existed before WWII was the .300 H&H Magnum.
introduced as a cartridge in 1925, and chambered in the Win M70 in 1937.
The next .300 Magnum in the Model 70 was the .300 Winchester magnum introduced in 1963.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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