That's not true-the BC/SD/V of the big 6.5s mimic the big .338s. In many cases the TOF is less w/ the 6.5 (less drift). It shoots flatter but does run out of appropriate V for expansion and E for penetration at around 1,000 (that's a 140-160 gr bullet w/ a MV of 3,150-3,200 fps). I've seen the animals fall off cliffs in TX (aoudad, deer) with our farthest shot at 850. The high SD of the 6.5 does the penetrating work. My two favorite calibers. The .338 has gobs more energy out beyond that...good to 1,500+ for those who wish to try. The long shots mentioned above were under ideal conditions (perfect weather, tailwind, perfect rest setup bipods/backpack, custom bansner's rifle, handloads, spotter, etc.) When i say 6.5, I mean a mag cartridge holding at least 65 gr of powder. The 6.5s are not all the same. Believe me, it WILL do! "Hell, I was there!!!" several times. Am I happy about all the new lil 6.5s out there (the craze?) No. It's gotten much harder to find reloading components.
Advertising/Mass production is not my friend. I'll take the shot w/ the 264 or the 338, but the 264 (6.5 lbs) is much easier carrying up/down mountains...Take a look at the data below. The 264 is clearly good for hunting to 1,000 yds. The .338 can reach out farther. It's also easier to make an accurate shot w/ the 264 due to its flatter trajectory and lesser recoil.
264-300 WSM (3,250 fps/140 gr Berger VLD) SD 0.287 (0.320 w/ 160s!)
1000 yds
1849 fps
1062 ft/lbs
-201.9 drop
338 A-Sq (3,150 fps/250 gr Barnes LRX) SD 0.313
1000 yds
1741 fps
1514 ft/lbs
-220.6 drop
'Crudmore. LOL Ain't gonna do it. PRC/Wby/RSAUM/WSM/6.5-06 A-sq AI/6.5-284-they'll do it! These are the only pics I can easily obtain here, but this aoudad was taken at 720 yds (it went straight down. Didn't move 1 in. horizontally. At that range, it was like shooting it at point blank range w/ a needmore.) For the recovery (at the top of that mountain, up a lot of rim rock,) my spotter-son carried it down and was met by the landowner with his skid-steer on some horse trail at the bottom. Again, not a needmore or other puny-cased 6.5. Coca-cola in another form. Fine for deer with the right bullet at modest range. Like McDs, the hamburgers keep getting smaller as the price and profitability increases.