Hornady offers a .308 Win 168gr ELD-Match load that at 3,200 ft (where I live) and 50F is moving at 1,395 fps at 1,100 yards so still not transonic. Increase the temperature by 30F and the bullet remains supersonic at 1,200 yards. Bullet stability in the transonic range is greatly affected by length with shorter bullets typically being more stable. The 147gr ELD-Match is quite a bit longer than the 168gr ELD-Match so how these two examples compare in real world use at these longer ranges, and specifically in the transonic range is anyone's guess. As for the .308 Win at longer ranges, there are many F-Class FT-R shooters putting all 20 shots inside an moa 10 ring at 1,000 yards, some with at least half of those in the X ring.