Ah, so you meant .308 verses 6.5 creedmoor then yes the slippery .264 bullets are good but the comparison uses one of the best / heavy for calibre bullets in 6.5 against but not for .308, if you run the 208 gr ELD in .308 (.348 G7 BC)at 2450 fps at muzzle then at 500 - 1500 it beats the creedmoor in terms of wind drift and in terms of energy, still has 1001 ft-lb at 900 yards and 536 at 1500 yards. So if you do an apples for apples comparison then there's not a lot in it, both bullets would require a faster twist than a lot of current factory rifles have too.
Not even vaguely true. The 147gr ELD-M is designed for 1:8" twist barrels, which is what the vast majority of Creedmoors have. It has a Miller value of >1.8 from memory, the same as the 143gr ELD-X. A few barrels have slightly faster 1:7.5" twists. No factory Creedmoor barrels are slower than 1:8" as far as I know.
The 208gr bullet will stabilise in 1:10" and 1:11" .308 barrels. However the problem is magazine length, many factory .308 mags can't handle the 178gr ELD-X let alone the 208gr, especially if there is seated closer to the lands than SAAMI c.o.a.l. I have an aftermarket mag that will allow use of both, but the 208gr does not shoot well in my 1:11" T3, by far the worst bullet I've tried in it so far.
The 208gr ELD-X is shot far more in the 300 Win Mag and similar long action rifles.
If you want to compare apples, then the best test is the 143gr ELD-X vs the 178gr ELD-X, both commonly used hunting bullets in their respective cartridges.
The argument about 6.5s is a bit pointless. The essence of the 6.5 Creedmoor is that it is an inherently accurate round, extremely easy to load for and available in a reasonably wide range of factory ammunition. Some of the factory ammunition is outstandingly accurate especially the Hornady offerings. The same reports are coming through over and over again, experienced shooters buying a Creedmoor and finding that it is the easiest rifle to set up and shoot accurately at the standard 100yds and out to 600-700yds than any other cartridges they've ever used before.
In part this is due to the fact that factory rifles are being produced with the correct twist right from the get go, rather than traditional twists trying to shoot the long for calibre bullets that are a relatively recent phenomenon.
Also it is down to the mysterious internal ballistics that I do not have the patience or inclination to try and understand fully. The story of the Creedmoor's development is well worth reading and considering in the light of what technologies were available then, compared to when some of the other 6.5's were invented.
Ultimately though if you put experienced match shooter reloaders up against each other with a 6.5 Creedmoor, a 6x47 Lapua and a quality .260 Remington, you are going to have a very tight competition.