what are you looking to do with a .243win.? .257wby?

I think I'd get a .270wsm over the .257wby, short action, no belt, higher BC's, SD's, still very fast, cheaper probably.

It is plenty flat and has a niche, and I think is 1 of the 2 most popular Weatherby's.

Personally fast/flat has it's place, but I think we almost give it too much value nowadays, ALL bullets drop, and most are closer to one another than you would think.