And one more very good calibers to look at is the 270 wsm with 130 grainers
and the 270AI
If you want speed go with a 25-06AI with 87 grainers at 3920 fps.
it's only 60 fps slower than the 257 weatherby and does it with 10 grains less powder.
The BCs of the 6.5mm and 7mm are waaay better than the 257 and 270.