I used the 6.5X.284 for 1000yard BR shooting. It is accurate, mild recoiling,and used the barrel up in 1200-1300 rounds. Used H4350 & H4831 with 140 gr bullets. Also had a NULA in the same caliber. Nice hunting round and took several mule and whitetail deer. Eventually burned the throat out shooting prairie dogs.
At the end of the day it really is just a re invented .270...ballistics are very close. I have thought about getting a .270 with a 8.5 twist and shooting some of the new LR bullets. A lot simpler and I bet it would be pretty darn good.
Lefty C
