I too have shot clean at 600 yards a couple of times with my 260 but never with 308. So, I have been pondering this conundrum.
We all have a tendency to focus on wind resistance when choosing our bullets simply because that's where the numbers point us to. But, as my Dad used to say, "Not all things that count can be counted". Your statement makes a case for less recoil resulting in greater precision.
I suspect that the thing we're failing to consider during our selection of bullets is torque. Torque (the hidden aspect of recoil) may play a bigger role than we suspect. That would explain why Jade is having better results with an 11 twist than with a 10 twist, in spite of the numbers indicating that a 10 twist should be preferred. Just saying...
Joe
I also suspect torque is playing a bigger role in the real accuracy of the heavy .308 bullets than most recoil. It magnifies every detail of the hold and set-up that don't cause dropped points with an 18 lb .223 or a 22 lb .260/6mm/etc.
I also think a 1 in 11" twist will alleviate the issue somewhat. We've measured the 208 ELD to have the full BC that Hornady advertises at 1000 ft elevation from a 1 in 11" twist. The 230 Berger OTM loses a lot of BC. We haven't measured the 200.20X yet, but if it is working for Jade ...
However, having seen Jade shoot, his technique is impeccable. A recoil management issue that is showing up for a lot of shooters may be prevented by Jade's technique.