You may want to check some trajectory tables and compare the 6.5's to the 308 and 30/06. The 6.5's use higher BC bullets, which gives them LESS drop and more retained energy at longer ranges.yeah but you want something that will pack quite a punch at 1K yards if you want a long ranger get something that packs a punch out to those ranges, it also helps with trajectory with smaller calibers you will be aiming close to 4 feet above the target i rather have the aim 2 feet or less.
Those were both figured on JBM's traj. table. I've used this program to figure drop for my rifles and feel it's pretty accurate for me. Feel free to punch the #'s yourself you don't believe me. I was merely giving examples of light recoiling 1K capable cartridges.there is no way the .308 or the 260 rem has a trajectory of -39.1MOA drop at 1000 yards maybe double that. the 7mm Rem Magnum has lower MOA trajectory then either caliber. 7mm Rem Magnum is the best choice for 1000 yards .