* ... with the right ammo, which took me quite some time to find a factory load & round that would shoot this tightly.
1:12 twist is hard to work with. A lot of modern rounds made today will not stabilize properly with it; I currently have a small list of rounds that won't, with shot groups & shot data. And with Applied Ballistic's Stability Calculator now directly integrated into their application, it is easy to see what is and isn't stable. Many rounds are either too heavy, too long, or both, for 1:12 twist. Those that are stable, don't have the reach. Finding a round that can reach 850-1000 yards, and is stable enough to group tightly, has been a challenge. Seeing 168gr TMK perform so well, and that it works well in the Federal T308T factory load -- having great enough velocity of 2603fps from a 20" and 2653fps from a 24" to reach 1000 yards -- has been a real joy to find.
This said, I don't know if the round is spinning fast enough out past 700 yards to group as well as a 1:10 barrel, and I have yet to find out. No one has ever given me a good answer as to what is a solid factory round that that performs well from the AW/AT barrels in 1:12 twist in the US, and this is an affordable and effective round that does. This data was important to share.