Twist rate for 6.8mm spc

Answer 1

You want a 1 in 12" or 1 in 11" twist. The twist is not only important for accuracy and stabilization of the bullet, a faster twist decreases velocity and increases pressures (which is bad). You also want a barrel that is chambered SAAMI "Spec II" or in other words has chambered with a .100" freebore or throat. The freebore is required to have a reliable, accurate rifle that functions at safe chamber pressures and allows safe use of most commercially available ammunition. There are a lot of manufacturers still selling "Spec I" 1/9 or 1/10 twist barrels, be careful.