Case of parallel development really, the 280 Ross (Canadian), 276 Enfield (English)& 7x64mm Brenneke (German).
All fantastic rounds in there own right.

Yes the 7mm-06 or 280 Remington etc may have come later in time, but it just goes to show how great minds think alike!
Really the 280AI is just more of a good thing, virtually 100 years after all these 'oldies' came out, it certainly makes a very efficient round even more so now with far better powders!
It will be another string to the 7mm family worth looking at, especially for those who prefer taking longer shots.
Me, I'll stick the 7x64mm; I don't shoot 'long' distance (under 300 yards maximum)- but then I'm a bit biased when it comes to the 64mm cases made by Herr Brenneke.
93x64mm