So if they start making 270 barrels with a 1:8 twist it would be a better calibre than it already is?
If there was ever a redundant cartridge/caliber to get rid of it's the 270. But to answer your question - yes if it had 1:8 twist barrels it would be a more effective caliber as it could handle long high BC bullets, but it seems like a waste of time due to the calibers of 6.5 and 7mm on each side of it which already have fast twists.
.277 is still a nice bullet diameter for the balance of weight, recoil, and terminal effectiveness but there is no denying that it is surrounded on each side by better options (by the numbers) in .264 or .284 bore.
Would it also out perform or match a lot of the modern cartridges developed in more recent years?
The .270 has got to be good as it's maintained a century-long tenure of popularity and it can kill deer just as dead a hundred years later.
However, there are ways that modern cartridges have been improved. Hunters who go out of their way to choose the .270 today are probably doing it for nostalgia’s sake and bias as much as performance. That’s not because it doesn’t work, but because there are more-refined options available.
Nobody today would ever design the .270 Winchester as it is. The principles of modern cartridge design give us cartridges that usually propel bullets more efficiently, are designed for longer, low-drag bullets, and conform to chamber designs that produce better inherent accuracy. Cartridges like the 6.5 CM, 6.5 PRC and 6.8 Western embrace the characteristics that are good and impressive about the .270 Winchester, just execute it better and more efficiently.
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