THey do great as long as velocity is held to 3200 fps or so. I do now feel though that a 1-8 twist with at least a 5 groove design is a better match for this bullet and with the 7mm AM a 1-9 with at least a 5 groove should be great as far as bullets being able to handle as much velocity as the round can produce.
The 1-7 twist is still viable though, there are some 225 and 250 gr ULD RBBTs coming soon which will require this twist and with the velocity of these very heavy bullets, they should not stress the bullet with this twist rate.
This was the original reason why we went with the 1-7 Lilja barrels, to hopefully cover everything from the 200 gr up to the 250 gr ULD RBBT. Still a 200 gr ULD RBBT loaded to 3200 fps is hardly anything to feel bad about!!!
This old boy took two of them in the shoulder at 715 yards before he could make it to the brushline. An extra 100 fps would not have killed him any faster!!