Greetings All,
The 7x64 came out in 1912, the same year as the .275 Holland and Holland Magnum. The 7x64 is arguably the ancestor of the .280 Remington that came out in 1958 but the .275 H&H is definitely the ancestor og the 7mm Remington Magnum that came out in 1962. There is not much that is really new in cartridge design.
Regards Grandpamac.
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