Thread: Anyone played with 223AI?

My only experience with an Ackley Improved cartridge has been nothing but positive. I bought my wife a Cooper Custom Classic in 250 Savage AI and fire forming the Win cases was not only very easy but they proved to be very accurate and even the fire forming loads passed the Cooper 3 shot in less than a 1/2" at 100 yard guarantee.
With a 40 grain load of RL15 using Winchester brass and Fed 210 Match primers the Ackley load is producing 3088 fps with 100 grain Sierra GK projectiles, this also shot 5 shot groups that are less that .5" at 100 meters.
There are no pressure signs and the cases expand less than .001" at the .200" mark from new to fully fire formed. These loads are 1 grain lower than the 41 grain max load shown in the 6th Edition of the Sierra reloading Manual.