JMHO but it seems to me that over the years,6mm, 6.5 and 7mm have gotten the bullet development attention for target work that the 270 has not.Also 6.5 and 7mm(.284 that is; the 270 Winchester IS a true 7mm) have traditionally been built and offered with longer bullets and faster twists to accomodate the heavier bullets for which they are noted.It would do no good for a manufacturer to build a 270 bullet with a BC over .600 if no one has the barrels to shoot it.
Given the military pedigree of the 6.5 and 7mm bore sizes,and the use of long heavy bullets, faster twists were standard in those bore sizes;the 270, OTOH,was conceieved solely as a hunting cartridge,and with the bullets of the day,its' 10 twist was fine.I personally think anyone building a 270 today would be well served building it with a faster twist.
Since it sits squarely in the middle between 6.5 and 7mm,(and we know those two calibers are very good) I see no reason why someone who put their mind to it, could not build a 270 bullet of great accuracy and high enough BC to at least stay in the ball park past 600 yards.
I think the cartridge is capable;it's likely more the bullets, barrels, and shooters attitudes that hold it back in the LR endeavors,far as I can tell.
