I've got a load for my 308 that's flatter than the 260 running 140 vlds and gives up less than 10" of wind in a full 10 mph 1000 yard 90 degree value. 10" more of no correction. It's a fraction of that when corrections are made and a small misjudgment is made.
If you can take the recoil of the 208-210s, you don't give up any wind and 10-20" of trajectory against the 260/140 combo.
The 308 isn't what it was 20 years ago.
Besides, I think too much emphasis is placed on trajectory. 20moa bases, adjustable turrets with reliable tracking and laser rangefinders have made 'flat trajectories' just about a null and mute point. It looks good on paper but that's about it. Paper ballistics are always fun but the fun runs out when you find out your hummer barrel has just been eaten up by being too overbore. You know, from chasing those fun paper ballistics. I've learned this the hard way but I really started to cry when I had a barrel chambered in 6.5x284. Hands down the most amazing barrel I've ever owned. Surgical accuracy with a wide variety of powders, bullets, primers....it just shot everything I fed it and amazingly, even several grains of powder apart, same 300 yard poi. Using a given charge weight and different bullet manufacturers of the same weight, had the same poi at 300 yards as well. If it weren't for slight BC differences, almost the exact same poi at 700 yards too. By the time I figured out my loads, drops etc...it was done. I wish I could find another barrel like that. If I ever end up with a hummer like that again but in 308, I'll be enjoying stupid accuracy for a long time. I'm sure some of it had to do with the caliber but that really was a special barrel. Was.
M