Just remember that the .222 was designed with a lower psi than a .223. That does not mean that the .222 can not be loaded to .223 psi. I don't see any reason it won't work, but it is not ideal with less powder. For 100 yds, velocity is not a big deal. The 80 grain bullets might not go to sleep in 100 yards, so you won't get as small as groups.