https://ronspomeroutdoors.com/blog/6...70-winchester/

damn informative link, and it shows the importance of selecting the correct barrel and twist rate.
a 1 in 8.5:1 twist rate on a 270 would allow it to compete to well past 1000 yards with a longer range and higher ballistic coefficient bullet design.

http://bergerbullets.com/twist-rate-calculator-3/

http://bergerbullets.com/product/270...-elite-hunter/