A high bc .257" bullet will not do anything better than a high bc 6 & 6.5 mm.
Just like there is no need for a .292" caliber since it will not do anything better than a .284" or .308"
If someone wants to re-invent the wheel, it better roll better than other wheels that already exist. Otherwise nobody will care to change their wheels.
It isn't the cost. It's the lack of demand.As I have read through all these posts, there has been a thought which keeps nagging me in the back of my mind. I seem to recall that there is a discrepancy between the cost of 6mm/6.5mm cups and the longer (more costly) cups for the .25 caliber Match Target bullets. This stems from a discussion with the Stark family when they were making some of the best match/varmint bullets for the time period. I simply don't recall all of the details but the gist was that the .25 caliber Match bullets cost more to make because of the jackets.
Does anyone have any information about this?