I have built a couple 22-6mm AI, the first was a Shilen 8 twist shooting 80 gr. A-Max and RL22. And a recent build, I used a Rem. 223 1-12 twist take-off barrel shooting H4350 behind a 55 V-Max. My reamer has .060 FB with a no turn neck, I also agree that the Ackley version will extend the life of your brass and have less maintenance.