I read recently the Marine Corps is looking for M14s to use in Iraq. They want a rifle capable of hitting a man size target up to 800 yds. and neutralizing it (as in kill). The problem; a president called Clinton made sure most of the M14s went under the torch when they were taken out of service. (He and the little lady didn't like Marines, if you remember). It sounds like they finally realize a .224 bullet may be fine for short range, jungle warfare but not suited to long range, open terrain shooting. (I'm not blaming this lack of foresight on the Marines, but on higher brass).
So, is the .223 Rem a long range caliber? I don't think so!