Not out shined, just out pressed/publicized!

Since I was a snotty nosed brat, the media has promoted the the metric calibers, and the bullet [big name] makers and firearms manufactures have gone along. The .257 can and does, "out shine" the calibers on either side . . . it just requires more desire and effort.
There is nothing magic regarding 6.5 (.264) caliber bullet - it's just that, "from day one", they were offered in LONG/heavy - for caliber- weights. Applying the the same principal to the .25 Cal. model, imagine the (G1) BC for a 130 gr. BT - Ok, don't imagine - it would be about .6, and, at sea-level, Std conditions, would be perfectly stable (Sg 1.5) via a 1:8.5" barrel! Nothing earth shattering there! An additional 5 gr., and about .050" longer bullet could well produce a BC of around .63, and require only 1:8.1" twist to achieve Sg 1.5. No, this won't change anything - not too soon anyway - it's just the why of it! The all American caliber has been branded as pretty much,"a red-headed step-child", or, a rented mule!

RG