The .223 is much cheaper to shoot specially if you don't handload, but even if you do, the .223 is still the way to go, for now anyway. Factory ammo will cost as little a $3 or less for 20 rounds for the .223, but best price for the .204 is $12 or more for 20. For a handloader, new .204 brass is still not available and may be as late as June or later before it is. If ammo cost/availablility is any concern I'd recommend the .223. The handis shoot extremely well with several different factory choices that are easy on the pocket book.... :wink: