The 30-40 U.S Govt went into service 131 years ago and I've just built a rifle in that caliber
Just a click slower than a 308 Winchester
I have just done a ballistic table for it and it has enough velocity and energy to be ethical to 500m for my hunting style.
Like your 270 7x64 comparison the 30-40 should out perform the practically identical 303 British, due to the 1:10" barrel twist and better bullet selection
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