.243 win = 6x50 mm (based on the 7.62 NATO
odd
6mm Remington 6x57 (based on the Mauser 7x57)
Split the difference with a 6.5x55
All of these calibers are favored in the West where most shots are long distance.
But folks will buy what they think will work best for them and not so web-pundit.
Guns are like girls and cars, there will always be a fight. :)
https://www.youtube.com/watch?v=hiSxaddm2OY