I have a 22-6mm AI made by a benchrest shooter and gunsmith from Detroit Lakes, MN. It has a 40 degree shoulder. The .224 Clark has a 30 degree shoulder and the 6mm case has a 26 degree shoulder. My expectancies are about 1000 rounds before refreshing the chamber. My barrel is a 1 in 7" twist Lilja straight non-taper 30" barrel and the plan is to cut off the threads and chamber when it is worn and re-chamber and thread at least once more to the same chamber and then go to a 22-250 AI. The action is a trued Rem 700 LA and it is set up as a single shot. I have shot 75 and 80 grain bullets and will try 90 grain bullets this spring.
