Let's see now. You've got a .222 that shoots well. You've got lots of .223 ammo. You want to change a "fantastic shooter" Model 788 over in order to shoot up your .223 ammo? I agree with Ncsurveyor, based on what you've said in your threads. By the way, before typing this reply I just looked in the Midway catalog and found that Lapua, Norma, Remington, and Winchester all are marketing .222 brass. You can do lots of handloading for your "fantastic shooter" for a very long time, I would think. Why take a chance on screwing up a fantastic shooter in order to blast up a pile of .223 ammo? If it were me, I'd keep the .222 as is and enjoy it. Then (maybe) I'd keep my eyes open for another rifle in .223. No sensible need to put a fine .222 under the knife that I can see. There are plenty of .223's on the market that you could acquire, and even butcher up if you felt a need to. Just think--if you sold your .222, someone could acquire a fantastic shooter and spend many happy years loading and shooting it, not to mention wondering why in heck a previous owner ever sold it. All of this while you try to make some .223 work for you while wishing at the same time that you never got rid of your .222.