the BDC reticle wont match up.....but it will still function like a normal scope.
a rough estimate for the BDC reticle with a 100yd zero:
100yds on the .223 reticle = 100yds .22lr
200yds on the .223 reticle = 125yds .22lr
300yds on the .223 reticle = 150yds .22lr
400yds on the .223 reticle = 175yds .22lr
500yds on the .223 reticle = 210yds .22lr